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here is the log from the commit of package python312 for openSUSE:Factory 
checked in at 2025-05-26 18:31:57
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Comparing /work/SRC/openSUSE:Factory/python312 (Old)
 and      /work/SRC/openSUSE:Factory/.python312.new.2732 (New)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Package is "python312"

Mon May 26 18:31:57 2025 rev:33 rq:1279315 version:3.12.10

Changes:
--------
--- /work/SRC/openSUSE:Factory/python312/python312.changes      2025-05-13 
20:11:52.182954104 +0200
+++ /work/SRC/openSUSE:Factory/.python312.new.2732/python312.changes    
2025-05-26 18:32:52.764724396 +0200
@@ -1,0 +2,7 @@
+Fri May 16 13:44:12 UTC 2025 - Matej Cepl <mc...@cepl.eu>
+
+- Add CVE-2025-4516-DecodeError-handler.patch fixing
+  CVE-2025-4516 (bsc#1243273) blocking DecodeError handling
+  vulnerability, which could lead to DoS.
+
+-------------------------------------------------------------------

New:
----
  CVE-2025-4516-DecodeError-handler.patch

BETA DEBUG BEGIN:
  New:
- Add CVE-2025-4516-DecodeError-handler.patch fixing
  CVE-2025-4516 (bsc#1243273) blocking DecodeError handling
BETA DEBUG END:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Other differences:
------------------
++++++ python312.spec ++++++
--- /var/tmp/diff_new_pack.GeTQlr/_old  2025-05-26 18:32:53.620760286 +0200
+++ /var/tmp/diff_new_pack.GeTQlr/_new  2025-05-26 18:32:53.620760286 +0200
@@ -184,6 +184,9 @@
 # PATCH-FIX-SLE doc-py38-to-py36.patch mc...@suse.com
 # Make documentation extensions working with Python 3.6
 Patch44:        doc-py38-to-py36.patch
+# PATCH-FIX-UPSTREAM CVE-2025-4516-DecodeError-handler.patch bsc#1243273 
mc...@suse.com
+# patch from gh#python/cpython!134337
+Patch45:        CVE-2025-4516-DecodeError-handler.patch
 BuildRequires:  autoconf-archive
 BuildRequires:  automake
 BuildRequires:  fdupes

++++++ CVE-2025-4516-DecodeError-handler.patch ++++++
>From a75953b347716fff694aa59a7c7c2489fa50d1f5 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storch...@gmail.com>
Date: Tue, 20 May 2025 15:46:57 +0300
Subject: [PATCH] [3.12] gh-133767: Fix use-after-free in the unicode-escape
 decoder with an error handler (GH-129648) (GH-133944)

If the error handler is used, a new bytes object is created to set as
the object attribute of UnicodeDecodeError, and that bytes object then
replaces the original data. A pointer to the decoded data will became invalid
after destroying that temporary bytes object. So we need other way to return
the first invalid escape from _PyUnicode_DecodeUnicodeEscapeInternal().

_PyBytes_DecodeEscape() does not have such issue, because it does not
use the error handlers registry, but it should be changed for compatibility
with _PyUnicode_DecodeUnicodeEscapeInternal().
(cherry picked from commit 9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e)
(cherry picked from commit 6279eb8c076d89d3739a6edb393e43c7929b429d)

Co-authored-by: Serhiy Storchaka <storch...@gmail.com>
---
 Include/cpython/bytesobject.h                                            |    
4 
 Include/cpython/unicodeobject.h                                          |   
13 ++
 Lib/test/test_codeccallbacks.py                                          |   
39 ++++++
 Lib/test/test_codecs.py                                                  |   
52 ++++++--
 Misc/NEWS.d/next/Security/2025-05-09-20-22-54.gh-issue-133767.kN2i3Q.rst |    
2 
 Objects/bytesobject.c                                                    |   
54 +++++---
 Objects/unicodeobject.c                                                  |   
61 +++++++---
 Parser/string_parser.c                                                   |   
26 ++--
 8 files changed, 194 insertions(+), 57 deletions(-)
 create mode 100644 
Misc/NEWS.d/next/Security/2025-05-09-20-22-54.gh-issue-133767.kN2i3Q.rst

Index: Python-3.12.10/Include/cpython/bytesobject.h
===================================================================
--- Python-3.12.10.orig/Include/cpython/bytesobject.h   2025-04-08 
11:35:47.000000000 +0000
+++ Python-3.12.10/Include/cpython/bytesobject.h        2025-05-22 
12:38:07.205729906 +0000
@@ -25,6 +25,10 @@
     int use_bytearray);
 
 /* Helper for PyBytes_DecodeEscape that detects invalid escape chars. */
+PyAPI_FUNC(PyObject*) _PyBytes_DecodeEscape2(const char *, Py_ssize_t,
+                                             const char *,
+                                             int *, const char **);
+// Export for binary compatibility.
 PyAPI_FUNC(PyObject *) _PyBytes_DecodeEscape(const char *, Py_ssize_t,
                                              const char *, const char **);
 
Index: Python-3.12.10/Include/cpython/unicodeobject.h
===================================================================
--- Python-3.12.10.orig/Include/cpython/unicodeobject.h 2025-04-08 
11:35:47.000000000 +0000
+++ Python-3.12.10/Include/cpython/unicodeobject.h      2025-05-22 
12:38:07.205905378 +0000
@@ -684,6 +684,19 @@
 );
 /* Helper for PyUnicode_DecodeUnicodeEscape that detects invalid escape
    chars. */
+PyAPI_FUNC(PyObject*) _PyUnicode_DecodeUnicodeEscapeInternal2(
+    const char *string,     /* Unicode-Escape encoded string */
+    Py_ssize_t length,      /* size of string */
+    const char *errors,     /* error handling */
+    Py_ssize_t *consumed,   /* bytes consumed */
+    int *first_invalid_escape_char, /* on return, if not -1, contain the first
+                                       invalid escaped char (<= 0xff) or 
invalid
+                                       octal escape (> 0xff) in string. */
+    const char **first_invalid_escape_ptr); /* on return, if not NULL, may
+                                        point to the first invalid escaped
+                                        char in string.
+                                        May be NULL if errors is not NULL. */
+// Export for binary compatibility.
 PyAPI_FUNC(PyObject*) _PyUnicode_DecodeUnicodeEscapeInternal(
         const char *string,     /* Unicode-Escape encoded string */
         Py_ssize_t length,      /* size of string */
Index: Python-3.12.10/Lib/test/test_codeccallbacks.py
===================================================================
--- Python-3.12.10.orig/Lib/test/test_codeccallbacks.py 2025-05-22 
12:37:58.935377659 +0000
+++ Python-3.12.10/Lib/test/test_codeccallbacks.py      2025-05-22 
12:38:07.206131787 +0000
@@ -1,6 +1,7 @@
 import codecs
 import html.entities
 import itertools
+import re
 import sys
 import unicodedata
 import unittest
@@ -1124,7 +1125,7 @@
             text = 'abc<def>ghi'*n
             text.translate(charmap)
 
-    def test_mutatingdecodehandler(self):
+    def test_mutating_decode_handler(self):
         baddata = [
             ("ascii", b"\xff"),
             ("utf-7", b"++"),
@@ -1159,6 +1160,42 @@
         for (encoding, data) in baddata:
             self.assertEqual(data.decode(encoding, "test.mutating"), "\u4242")
 
+    def test_mutating_decode_handler_unicode_escape(self):
+        decode = codecs.unicode_escape_decode
+        def mutating(exc):
+            if isinstance(exc, UnicodeDecodeError):
+                r = data.get(exc.object[:exc.end])
+                if r is not None:
+                    exc.object = r[0] + exc.object[exc.end:]
+                    return ('\u0404', r[1])
+            raise AssertionError("don't know how to handle %r" % exc)
+
+        codecs.register_error('test.mutating2', mutating)
+        data = {
+            br'\x0': (b'\\', 0),
+            br'\x3': (b'xxx\\', 3),
+            br'\x5': (b'x\\', 1),
+        }
+        def check(input, expected, msg):
+            with self.assertWarns(DeprecationWarning) as cm:
+                self.assertEqual(decode(input, 'test.mutating2'), (expected, 
len(input)))
+            self.assertIn(msg, str(cm.warning))
+
+        check(br'\x0n\z', '\u0404\n\\z', r"invalid escape sequence '\z'")
+        check(br'\x0n\501', '\u0404\n\u0141', r"invalid octal escape sequence 
'\501'")
+        check(br'\x0z', '\u0404\\z', r"invalid escape sequence '\z'")
+
+        check(br'\x3n\zr', '\u0404\n\\zr', r"invalid escape sequence '\z'")
+        check(br'\x3zr', '\u0404\\zr', r"invalid escape sequence '\z'")
+        check(br'\x3z5', '\u0404\\z5', r"invalid escape sequence '\z'")
+        check(memoryview(br'\x3z5x')[:-1], '\u0404\\z5', r"invalid escape 
sequence '\z'")
+        check(memoryview(br'\x3z5xy')[:-2], '\u0404\\z5', r"invalid escape 
sequence '\z'")
+
+        check(br'\x5n\z', '\u0404\n\\z', r"invalid escape sequence '\z'")
+        check(br'\x5n\501', '\u0404\n\u0141', r"invalid octal escape sequence 
'\501'")
+        check(br'\x5z', '\u0404\\z', r"invalid escape sequence '\z'")
+        check(memoryview(br'\x5zy')[:-1], '\u0404\\z', r"invalid escape 
sequence '\z'")
+
     # issue32583
     def test_crashing_decode_handler(self):
         # better generating one more character to fill the extra space slot
Index: Python-3.12.10/Lib/test/test_codecs.py
===================================================================
--- Python-3.12.10.orig/Lib/test/test_codecs.py 2025-05-22 12:37:58.952566393 
+0000
+++ Python-3.12.10/Lib/test/test_codecs.py      2025-05-22 12:38:07.206633606 
+0000
@@ -1196,23 +1196,39 @@
         check(br"[\1010]", b"[A0]")
         check(br"[\x41]", b"[A]")
         check(br"[\x410]", b"[A0]")
+
+    def test_warnings(self):
+        decode = codecs.escape_decode
+        check = coding_checker(self, decode)
         for i in range(97, 123):
             b = bytes([i])
             if b not in b'abfnrtvx':
-                with self.assertWarns(DeprecationWarning):
+                with self.assertWarnsRegex(DeprecationWarning,
+                        r"invalid escape sequence '\\%c'" % i):
                     check(b"\\" + b, b"\\" + b)
-            with self.assertWarns(DeprecationWarning):
+            with self.assertWarnsRegex(DeprecationWarning,
+                    r"invalid escape sequence '\\%c'" % (i-32)):
                 check(b"\\" + b.upper(), b"\\" + b.upper())
-        with self.assertWarns(DeprecationWarning):
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid escape sequence '\\8'"):
             check(br"\8", b"\\8")
         with self.assertWarns(DeprecationWarning):
             check(br"\9", b"\\9")
-        with self.assertWarns(DeprecationWarning):
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid escape sequence '\\\xfa'") as cm:
             check(b"\\\xfa", b"\\\xfa")
         for i in range(0o400, 0o1000):
-            with self.assertWarns(DeprecationWarning):
+            with self.assertWarnsRegex(DeprecationWarning,
+                    r"invalid octal escape sequence '\\%o'" % i):
                 check(rb'\%o' % i, bytes([i & 0o377]))
 
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid escape sequence '\\z'"):
+            self.assertEqual(decode(br'\x\z', 'ignore'), (b'\\z', 4))
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid octal escape sequence '\\501'"):
+            self.assertEqual(decode(br'\x\501', 'ignore'), (b'A', 6))
+
     def test_errors(self):
         decode = codecs.escape_decode
         self.assertRaises(ValueError, decode, br"\x")
@@ -2479,24 +2495,40 @@
         check(br"[\x410]", "[A0]")
         check(br"\u20ac", "\u20ac")
         check(br"\U0001d120", "\U0001d120")
+
+    def test_decode_warnings(self):
+        decode = codecs.unicode_escape_decode
+        check = coding_checker(self, decode)
         for i in range(97, 123):
             b = bytes([i])
             if b not in b'abfnrtuvx':
-                with self.assertWarns(DeprecationWarning):
+                with self.assertWarnsRegex(DeprecationWarning,
+                        r"invalid escape sequence '\\%c'" % i):
                     check(b"\\" + b, "\\" + chr(i))
             if b.upper() not in b'UN':
-                with self.assertWarns(DeprecationWarning):
+                with self.assertWarnsRegex(DeprecationWarning,
+                        r"invalid escape sequence '\\%c'" % (i-32)):
                     check(b"\\" + b.upper(), "\\" + chr(i-32))
-        with self.assertWarns(DeprecationWarning):
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid escape sequence '\\8'"):
             check(br"\8", "\\8")
         with self.assertWarns(DeprecationWarning):
             check(br"\9", "\\9")
-        with self.assertWarns(DeprecationWarning):
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid escape sequence '\\\xfa'") as cm:
             check(b"\\\xfa", "\\\xfa")
         for i in range(0o400, 0o1000):
-            with self.assertWarns(DeprecationWarning):
+            with self.assertWarnsRegex(DeprecationWarning,
+                    r"invalid octal escape sequence '\\%o'" % i):
                 check(rb'\%o' % i, chr(i))
 
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid escape sequence '\\z'"):
+            self.assertEqual(decode(br'\x\z', 'ignore'), ('\\z', 4))
+        with self.assertWarnsRegex(DeprecationWarning,
+                r"invalid octal escape sequence '\\501'"):
+            self.assertEqual(decode(br'\x\501', 'ignore'), ('\u0141', 6))
+
     def test_decode_errors(self):
         decode = codecs.unicode_escape_decode
         for c, d in (b'x', 2), (b'u', 4), (b'U', 4):
Index: 
Python-3.12.10/Misc/NEWS.d/next/Security/2025-05-09-20-22-54.gh-issue-133767.kN2i3Q.rst
===================================================================
--- /dev/null   1970-01-01 00:00:00.000000000 +0000
+++ 
Python-3.12.10/Misc/NEWS.d/next/Security/2025-05-09-20-22-54.gh-issue-133767.kN2i3Q.rst
     2025-05-22 12:38:07.207057599 +0000
@@ -0,0 +1,2 @@
+Fix use-after-free in the "unicode-escape" decoder with a non-"strict" error
+handler.
Index: Python-3.12.10/Objects/bytesobject.c
===================================================================
--- Python-3.12.10.orig/Objects/bytesobject.c   2025-04-08 11:35:47.000000000 
+0000
+++ Python-3.12.10/Objects/bytesobject.c        2025-05-22 12:38:07.207534041 
+0000
@@ -1048,10 +1048,11 @@
 }
 
 /* Unescape a backslash-escaped string. */
-PyObject *_PyBytes_DecodeEscape(const char *s,
+PyObject *_PyBytes_DecodeEscape2(const char *s,
                                 Py_ssize_t len,
                                 const char *errors,
-                                const char **first_invalid_escape)
+                                int *first_invalid_escape_char,
+                                const char **first_invalid_escape_ptr)
 {
     int c;
     char *p;
@@ -1065,7 +1066,8 @@
         return NULL;
     writer.overallocate = 1;
 
-    *first_invalid_escape = NULL;
+    *first_invalid_escape_char = -1;
+    *first_invalid_escape_ptr = NULL;
 
     end = s + len;
     while (s < end) {
@@ -1103,9 +1105,10 @@
                     c = (c<<3) + *s++ - '0';
             }
             if (c > 0377) {
-                if (*first_invalid_escape == NULL) {
-                    *first_invalid_escape = s-3; /* Back up 3 chars, since 
we've
-                                                    already incremented s. */
+                if (*first_invalid_escape_char == -1) {
+                    *first_invalid_escape_char = c;
+                    /* Back up 3 chars, since we've already incremented s. */
+                    *first_invalid_escape_ptr = s - 3;
                 }
             }
             *p++ = c;
@@ -1146,9 +1149,10 @@
             break;
 
         default:
-            if (*first_invalid_escape == NULL) {
-                *first_invalid_escape = s-1; /* Back up one char, since we've
-                                                already incremented s. */
+            if (*first_invalid_escape_char == -1) {
+                *first_invalid_escape_char = (unsigned char)s[-1];
+                /* Back up one char, since we've already incremented s. */
+                *first_invalid_escape_ptr = s - 1;
             }
             *p++ = '\\';
             s--;
@@ -1162,23 +1166,37 @@
     return NULL;
 }
 
+// Export for binary compatibility.
+PyObject *_PyBytes_DecodeEscape(const char *s,
+                                Py_ssize_t len,
+                                const char *errors,
+                                const char **first_invalid_escape)
+{
+    int first_invalid_escape_char;
+    return _PyBytes_DecodeEscape2(
+            s, len, errors,
+            &first_invalid_escape_char,
+            first_invalid_escape);
+}
+
 PyObject *PyBytes_DecodeEscape(const char *s,
                                 Py_ssize_t len,
                                 const char *errors,
                                 Py_ssize_t Py_UNUSED(unicode),
                                 const char *Py_UNUSED(recode_encoding))
 {
-    const char* first_invalid_escape;
-    PyObject *result = _PyBytes_DecodeEscape(s, len, errors,
-                                             &first_invalid_escape);
+    int first_invalid_escape_char;
+    const char *first_invalid_escape_ptr;
+    PyObject *result = _PyBytes_DecodeEscape2(s, len, errors,
+                                             &first_invalid_escape_char,
+                                             &first_invalid_escape_ptr);
     if (result == NULL)
         return NULL;
-    if (first_invalid_escape != NULL) {
-        unsigned char c = *first_invalid_escape;
-        if ('4' <= c && c <= '7') {
+    if (first_invalid_escape_char != -1) {
+        if (first_invalid_escape_char > 0xff) {
             if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
-                                 "invalid octal escape sequence '\\%.3s'",
-                                 first_invalid_escape) < 0)
+                                 "invalid octal escape sequence '\\%o'",
+                                 first_invalid_escape_char) < 0)
             {
                 Py_DECREF(result);
                 return NULL;
@@ -1187,7 +1205,7 @@
         else {
             if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
                                  "invalid escape sequence '\\%c'",
-                                 c) < 0)
+                                 first_invalid_escape_char) < 0)
             {
                 Py_DECREF(result);
                 return NULL;
Index: Python-3.12.10/Objects/unicodeobject.c
===================================================================
--- Python-3.12.10.orig/Objects/unicodeobject.c 2025-04-08 11:35:47.000000000 
+0000
+++ Python-3.12.10/Objects/unicodeobject.c      2025-05-22 12:38:07.209060814 
+0000
@@ -6046,13 +6046,15 @@
 /* --- Unicode Escape Codec ----------------------------------------------- */
 
 PyObject *
-_PyUnicode_DecodeUnicodeEscapeInternal(const char *s,
+_PyUnicode_DecodeUnicodeEscapeInternal2(const char *s,
                                Py_ssize_t size,
                                const char *errors,
                                Py_ssize_t *consumed,
-                               const char **first_invalid_escape)
+                               int *first_invalid_escape_char,
+                               const char **first_invalid_escape_ptr)
 {
     const char *starts = s;
+    const char *initial_starts = starts;
     _PyUnicodeWriter writer;
     const char *end;
     PyObject *errorHandler = NULL;
@@ -6061,7 +6063,8 @@
     PyInterpreterState *interp = _PyInterpreterState_Get();
 
     // so we can remember if we've seen an invalid escape char or not
-    *first_invalid_escape = NULL;
+    *first_invalid_escape_char = -1;
+    *first_invalid_escape_ptr = NULL;
 
     if (size == 0) {
         if (consumed) {
@@ -6149,9 +6152,12 @@
                 }
             }
             if (ch > 0377) {
-                if (*first_invalid_escape == NULL) {
-                    *first_invalid_escape = s-3; /* Back up 3 chars, since 
we've
-                                                    already incremented s. */
+                if (*first_invalid_escape_char == -1) {
+                    *first_invalid_escape_char = ch;
+                    if (starts == initial_starts) {
+                        /* Back up 3 chars, since we've already incremented s. 
*/
+                        *first_invalid_escape_ptr = s - 3;
+                    }
                 }
             }
             WRITE_CHAR(ch);
@@ -6252,9 +6258,12 @@
             goto error;
 
         default:
-            if (*first_invalid_escape == NULL) {
-                *first_invalid_escape = s-1; /* Back up one char, since we've
-                                                already incremented s. */
+            if (*first_invalid_escape_char == -1) {
+                *first_invalid_escape_char = c;
+                if (starts == initial_starts) {
+                    /* Back up one char, since we've already incremented s. */
+                    *first_invalid_escape_ptr = s - 1;
+                }
             }
             WRITE_ASCII_CHAR('\\');
             WRITE_CHAR(c);
@@ -6293,24 +6302,40 @@
     return NULL;
 }
 
+// Export for binary compatibility.
+PyObject *
+_PyUnicode_DecodeUnicodeEscapeInternal(const char *s,
+                               Py_ssize_t size,
+                               const char *errors,
+                               Py_ssize_t *consumed,
+                               const char **first_invalid_escape)
+{
+    int first_invalid_escape_char;
+    return _PyUnicode_DecodeUnicodeEscapeInternal2(
+            s, size, errors, consumed,
+            &first_invalid_escape_char,
+            first_invalid_escape);
+}
+
 PyObject *
 _PyUnicode_DecodeUnicodeEscapeStateful(const char *s,
                               Py_ssize_t size,
                               const char *errors,
                               Py_ssize_t *consumed)
 {
-    const char *first_invalid_escape;
-    PyObject *result = _PyUnicode_DecodeUnicodeEscapeInternal(s, size, errors,
+    int first_invalid_escape_char;
+    const char *first_invalid_escape_ptr;
+    PyObject *result = _PyUnicode_DecodeUnicodeEscapeInternal2(s, size, errors,
                                                       consumed,
-                                                      &first_invalid_escape);
+                                                      
&first_invalid_escape_char,
+                                                      
&first_invalid_escape_ptr);
     if (result == NULL)
         return NULL;
-    if (first_invalid_escape != NULL) {
-        unsigned char c = *first_invalid_escape;
-        if ('4' <= c && c <= '7') {
+    if (first_invalid_escape_char != -1) {
+        if (first_invalid_escape_char > 0xff) {
             if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
-                                 "invalid octal escape sequence '\\%.3s'",
-                                 first_invalid_escape) < 0)
+                                 "invalid octal escape sequence '\\%o'",
+                                 first_invalid_escape_char) < 0)
             {
                 Py_DECREF(result);
                 return NULL;
@@ -6319,7 +6344,7 @@
         else {
             if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
                                  "invalid escape sequence '\\%c'",
-                                 c) < 0)
+                                 first_invalid_escape_char) < 0)
             {
                 Py_DECREF(result);
                 return NULL;
Index: Python-3.12.10/Parser/string_parser.c
===================================================================
--- Python-3.12.10.orig/Parser/string_parser.c  2025-04-08 11:35:47.000000000 
+0000
+++ Python-3.12.10/Parser/string_parser.c       2025-05-22 12:38:07.209950694 
+0000
@@ -181,15 +181,18 @@
     len = p - buf;
     s = buf;
 
-    const char *first_invalid_escape;
-    v = _PyUnicode_DecodeUnicodeEscapeInternal(s, len, NULL, NULL, 
&first_invalid_escape);
+    int first_invalid_escape_char;
+    const char *first_invalid_escape_ptr;
+    v = _PyUnicode_DecodeUnicodeEscapeInternal2(s, (Py_ssize_t)len, NULL, NULL,
+                                                &first_invalid_escape_char,
+                                                &first_invalid_escape_ptr);
 
     // HACK: later we can simply pass the line no, since we don't preserve the 
tokens
     // when we are decoding the string but we preserve the line numbers.
-    if (v != NULL && first_invalid_escape != NULL && t != NULL) {
-        if (warn_invalid_escape_sequence(parser, s, first_invalid_escape, t) < 
0) {
-            /* We have not decref u before because first_invalid_escape points
-               inside u. */
+    if (v != NULL && first_invalid_escape_ptr != NULL && t != NULL) {
+        if (warn_invalid_escape_sequence(parser, s, first_invalid_escape_ptr, 
t) < 0) {
+            /* We have not decref u before because first_invalid_escape_ptr
+               points inside u. */
             Py_XDECREF(u);
             Py_DECREF(v);
             return NULL;
@@ -202,14 +205,17 @@
 static PyObject *
 decode_bytes_with_escapes(Parser *p, const char *s, Py_ssize_t len, Token *t)
 {
-    const char *first_invalid_escape;
-    PyObject *result = _PyBytes_DecodeEscape(s, len, NULL, 
&first_invalid_escape);
+    int first_invalid_escape_char;
+    const char *first_invalid_escape_ptr;
+    PyObject *result = _PyBytes_DecodeEscape2(s, len, NULL,
+                                              &first_invalid_escape_char,
+                                              &first_invalid_escape_ptr);
     if (result == NULL) {
         return NULL;
     }
 
-    if (first_invalid_escape != NULL) {
-        if (warn_invalid_escape_sequence(p, s, first_invalid_escape, t) < 0) {
+    if (first_invalid_escape_ptr != NULL) {
+        if (warn_invalid_escape_sequence(p, s, first_invalid_escape_ptr, t) < 
0) {
             Py_DECREF(result);
             return NULL;
         }

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