https://github.com/python/cpython/commit/d786fbdfcc9d63e0f92df60f464c46ac6b4ce292
commit: d786fbdfcc9d63e0f92df60f464c46ac6b4ce292
branch: 3.14
author: Bénédikt Tran <[email protected]>
committer: picnixz <[email protected]>
date: 2026-07-04T10:46:47Z
summary:
[3.14] gh-152851: fix a crash when copying a BLAKE-2s/2b object (GH-153008)
(#153012)
[3.14] gh-152851: fix a crash when copying a BLAKE-2s/2b object (GH-153008)
(cherry picked from commit 5a400ceafbbd4456ac65fbdbcf5d62ce9e8e4f9f)
files:
A Misc/NEWS.d/next/Library/2026-07-04-11-14-06.gh-issue-152851.diYvTf.rst
M Modules/blake2module.c
diff --git
a/Misc/NEWS.d/next/Library/2026-07-04-11-14-06.gh-issue-152851.diYvTf.rst
b/Misc/NEWS.d/next/Library/2026-07-04-11-14-06.gh-issue-152851.diYvTf.rst
new file mode 100644
index 00000000000000..aab033ebeed695
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-07-04-11-14-06.gh-issue-152851.diYvTf.rst
@@ -0,0 +1,2 @@
+Prevent a crash when allocation fails while copying a :func:`BLAKE-2s/2b
+<hashlib.blake2b>` object. Patch by Bénédikt Tran.
diff --git a/Modules/blake2module.c b/Modules/blake2module.c
index e31fa8131f1ecf..c4fbd204d566d7 100644
--- a/Modules/blake2module.c
+++ b/Modules/blake2module.c
@@ -732,6 +732,11 @@ static int
blake2_blake2b_copy_locked(Blake2Object *self, Blake2Object *cpy)
{
assert(cpy != NULL);
+
+ // Ensure that the implementation type is consistent with the HACL* state.
+ // See https://github.com/python/cpython/issues/152851 for details.
+ cpy->impl = self->impl;
+
switch (self->impl) {
#if _Py_HACL_CAN_COMPILE_VEC256
case Blake2b_256: {
@@ -768,7 +773,6 @@ blake2_blake2b_copy_locked(Blake2Object *self, Blake2Object
*cpy)
default:
Py_UNREACHABLE();
}
- cpy->impl = self->impl;
return 0;
error:
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