https://github.com/python/cpython/commit/d35b1719a58c8682a22ef698e070e97661af8d14
commit: d35b1719a58c8682a22ef698e070e97661af8d14
branch: main
author: dev <[email protected]>
committer: sobolevn <[email protected]>
date: 2026-06-23T17:15:15+03:00
summary:
gh-151773: Fix NULL dereference in `PyContextVar_Set` (#151836)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-06-21-16-00-00.gh-issue-151773.mN4kRt.rst
M Python/context.c
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-21-16-00-00.gh-issue-151773.mN4kRt.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-21-16-00-00.gh-issue-151773.mN4kRt.rst
new file mode 100644
index 00000000000000..b4193c5e15ffef
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-21-16-00-00.gh-issue-151773.mN4kRt.rst
@@ -0,0 +1,2 @@
+Fix a crash in :func:`contextvars.ContextVar.set` when memory allocation
+fails.
diff --git a/Python/context.c b/Python/context.c
index 593e6ef90037cf..4678054ff3ad74 100644
--- a/Python/context.c
+++ b/Python/context.c
@@ -362,6 +362,9 @@ PyContextVar_Set(PyObject *ovar, PyObject *val)
Py_XINCREF(old_val);
PyContextToken *tok = token_new(ctx, var, old_val);
Py_XDECREF(old_val);
+ if (tok == NULL) {
+ return NULL;
+ }
if (contextvar_set(var, val)) {
Py_DECREF(tok);
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