https://github.com/python/cpython/commit/3186547c1ec76e1afab82ec32271ec5b9467fdeb
commit: 3186547c1ec76e1afab82ec32271ec5b9467fdeb
branch: main
author: sobolevn <[email protected]>
committer: sobolevn <[email protected]>
date: 2026-06-09T10:03:33Z
summary:
gh-151126: Fix missing `PyErr_NoMemory()` in `remove_unused_consts` (#151127)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-10-28-30.gh-issue-151126.DKa6Sl.rst
M Python/flowgraph.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-10-28-30.gh-issue-151126.DKa6Sl.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-10-28-30.gh-issue-151126.DKa6Sl.rst
new file mode 100644
index 000000000000000..3f699a50d7a42bb
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-10-28-30.gh-issue-151126.DKa6Sl.rst
@@ -0,0 +1,3 @@
+Fix a crash, when there's no memory left on a device,
+which happened in code compilation.
+Now it raises a proper :exc:`MemoryError`.
diff --git a/Python/flowgraph.c b/Python/flowgraph.c
index eb0faf8cd183885..324a4fc1f10a68e 100644
--- a/Python/flowgraph.c
+++ b/Python/flowgraph.c
@@ -3279,6 +3279,7 @@ remove_unused_consts(basicblock *entryblock, PyObject
*consts)
index_map = PyMem_Malloc(nconsts * sizeof(Py_ssize_t));
if (index_map == NULL) {
+ PyErr_NoMemory();
goto end;
}
for (Py_ssize_t i = 1; i < nconsts; i++) {
@@ -3331,6 +3332,7 @@ remove_unused_consts(basicblock *entryblock, PyObject
*consts)
/* adjust const indices in the bytecode */
reverse_index_map = PyMem_Malloc(nconsts * sizeof(Py_ssize_t));
if (reverse_index_map == NULL) {
+ PyErr_NoMemory();
goto end;
}
for (Py_ssize_t i = 0; i < nconsts; i++) {
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