https://github.com/python/cpython/commit/5a400ceafbbd4456ac65fbdbcf5d62ce9e8e4f9f
commit: 5a400ceafbbd4456ac65fbdbcf5d62ce9e8e4f9f
branch: main
author: Bénédikt Tran <[email protected]>
committer: picnixz <[email protected]>
date: 2026-07-04T12:09:42+02:00
summary:
gh-152851: fix a crash when copying a BLAKE-2s/2b object (#153008)
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 b71dd20925611e..ac7265bb9d6836 100644
--- a/Modules/blake2module.c
+++ b/Modules/blake2module.c
@@ -757,6 +757,10 @@ blake2_blake2b_copy_unlocked(Blake2Object *self,
Blake2Object *cpy)
} \
} while (0)
+ // 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:
@@ -778,7 +782,6 @@ blake2_blake2b_copy_unlocked(Blake2Object *self,
Blake2Object *cpy)
Py_UNREACHABLE();
}
#undef BLAKE2_COPY
- cpy->impl = self->impl;
return 0;
error:
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