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bpo-44184: Fix subtype_dealloc() for freed type (GH-26274)

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Fix a crash at Python exit when a deallocator function removes the
last strong reference to a heap type.

Don't read type memory after calling basedealloc() since
basedealloc() can deallocate the type and free its memory.

_PyMem_IsPtrFreed() argument is now constant.
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Victor Stinner 2021-05-21 19:19:54 +02:00 • committed by GitHub
parent 642fdfdc04
commit 615069eb08
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4 changed files with 46 additions and 4 deletions
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Include/internal/pycore_pymem.h
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@ -42,7 +42,7 @@ PyAPI_FUNC(int) _PyMem_SetDefaultAllocator(
fills newly allocated memory with CLEANBYTE (0xCD) and newly freed memory
with DEADBYTE (0xDD). Detect also "untouchable bytes" marked
with FORBIDDENBYTE (0xFD). */
static inline int _PyMem_IsPtrFreed(void *ptr)
static inline int _PyMem_IsPtrFreed(const void *ptr)
{
uintptr_t value = (uintptr_t)ptr;
#if SIZEOF_VOID_P == 8