https://github.com/python/cpython/commit/4b44b1e1fd654f3a3fefb02ae7fb26456fe33dc3
commit: 4b44b1e1fd654f3a3fefb02ae7fb26456fe33dc3
branch: main
author: Stan Ulbrych <[email protected]>
committer: StanFromIreland <[email protected]>
date: 2026-06-11T15:26:46+01:00
summary:
gh-151238: Check for `_get_resized_exprs` failure in
`_PyPegen_{joined,template}_str` (#151259)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-19-58.gh-issue-151238.C9Wu4x.rst
M Lib/test/test_fstring.py
M Parser/action_helpers.c
diff --git a/Lib/test/test_fstring.py b/Lib/test/test_fstring.py
index 05d0cbd2445c4cb..5cc02c30ec2ba33 100644
--- a/Lib/test/test_fstring.py
+++ b/Lib/test/test_fstring.py
@@ -593,6 +593,17 @@ def test_compile_time_concat_errors(self):
r"""b'' f''""",
])
+ def test_concat_decode_failure_does_not_crash(self):
+ script = r'''
+import builtins
+builtins.__import__ = builtins # Breaks warning machinery so
_get_resized_exprs returns NULL
+try:
+ compile('"x"f"\]"b""', '<test>', 'exec')
+except Exception:
+ pass
+'''
+ assert_python_ok('-c', script)
+
def test_literal(self):
self.assertEqual(f'', '')
self.assertEqual(f'a', 'a')
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-19-58.gh-issue-151238.C9Wu4x.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-19-58.gh-issue-151238.C9Wu4x.rst
new file mode 100644
index 000000000000000..fe7519fb4878952
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-19-58.gh-issue-151238.C9Wu4x.rst
@@ -0,0 +1,2 @@
+Fix a crash when compiling a concatenated f-string or t-string if an error
+occurs when processing one of it's parts.
diff --git a/Parser/action_helpers.c b/Parser/action_helpers.c
index 5e52bb838719046..c74eb34deb7c35c 100644
--- a/Parser/action_helpers.c
+++ b/Parser/action_helpers.c
@@ -1416,6 +1416,9 @@ expr_ty
_PyPegen_template_str(Parser *p, Token *a, asdl_expr_seq *raw_expressions,
Token *b) {
asdl_expr_seq *resized_exprs = _get_resized_exprs(p, a, raw_expressions,
b, TSTRING);
+ if (resized_exprs == NULL) {
+ return NULL;
+ }
return _PyAST_TemplateStr(resized_exprs, a->lineno, a->col_offset,
b->end_lineno, b->end_col_offset,
p->arena);
@@ -1425,6 +1428,9 @@ expr_ty
_PyPegen_joined_str(Parser *p, Token* a, asdl_expr_seq* raw_expressions,
Token*b) {
asdl_expr_seq *resized_exprs = _get_resized_exprs(p, a, raw_expressions,
b, FSTRING);
+ if (resized_exprs == NULL) {
+ return NULL;
+ }
return _PyAST_JoinedStr(resized_exprs, a->lineno, a->col_offset,
b->end_lineno, b->end_col_offset,
p->arena);
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