gh-142884: Use-After-Free Vulnerability Fixed in CPython array.array.tofile #142920
+37
−9
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the original code precomputed nblocks at the beginning of the function, but when a reentrant
writer cleared the array during the first callback, self->ob_item became NULL. The loop continued iterating based on the cached values and dereferenced the null pointer.
array.array.tofilevia reentrant writer #142884