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gh-121460: Skip freeing unallocated arenas (gh-121491) 

`munmap(NULL)` is not noop, like `free(NULL)` is.

Fixes an observed testsuite hang on 32-bit ARM systems.
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Stefano Rivera 2024-07-10 09:40:55 -07:00 committed by GitHub
parent 0177a34335
commit a802277914
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1 changed files with 8 additions and 0 deletions
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8
Objects/obmalloc.c
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@ -386,8 +386,16 @@ _PyMem_ArenaFree(void *Py_UNUSED(ctx), void *ptr,
)
{
#ifdef MS_WINDOWS
/* Unlike free(), VirtualFree() does not special-case NULL to noop. */
if (ptr == NULL) {
return;
}
VirtualFree(ptr, 0, MEM_RELEASE);
#elif defined(ARENAS_USE_MMAP)
/* Unlike free(), munmap() does not special-case NULL to noop. */
if (ptr == NULL) {
return;
}
munmap(ptr, size);
#else
free(ptr);