[issue31626] Writing in freed memory in _PyMem_DebugRawRealloc() after shrinking a memory block

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> The current code in not correct on all platforms.

My PR 4119 only changes the behaviour on OpenBSD, but I'm not sure about that. Maybe it's simpler to apply this fix on all platforms, as I asked on the PR itself?

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<https://bugs.python.org/issue31626>
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