Bug report

Bug description:

Normally this is not a problem but if _PyMem_FreeDelayed(NULL) is called an (quite!) improbably high number of times in a single thread it can lead to memory exhaustion because the NULL is added to a queue. Fix is just to add a NULL check like _PyObject_XDecRefDelayed().

CPython versions tested on:

3.14

Operating systems tested on:

No response

Linked PRs

• gh-131719: add NULL ptr check to _PyMem_FreeDelayed #131720
• [3.13] gh-131719: add NULL pointer check to _PyMem_FreeDelayed (gh-131720) #131722