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[3.13] gh-151065: Copy fix for memory leak from mimalloc upstream (GH-151066) (GH-151385)

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Applies d7a72c4912 to our copy of mimalloc.
(cherry picked from commit 80f9467434)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
This commit is contained in:
Miss Islington (bot) 2026-06-12 03:18:14 +02:00 • committed by GitHub
parent e812fe9bc4
commit 8754abc358
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2 changed files with 4 additions and 3 deletions
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1
Misc/NEWS.d/next/Core_and_Builtins/2026-06-08-05-31-22.gh-issue-151065._o_31F.rst Normal file
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@ -0,0 +1 @@
Fix memory leak when using the :ref:`mimalloc memory allocator <mimalloc>`.

6
Objects/mimalloc/init.c
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@ -183,9 +183,9 @@ mi_heap_t* _mi_heap_main_get(void) {
// note: in x64 in release build `sizeof(mi_thread_data_t)` is under 4KiB (= OS page size).
typedef struct mi_thread_data_s {
mi_heap_t heap; // must come first due to cast in `_mi_heap_done`
mi_heap_t heap; // must come first due to cast in `_mi_heap_done`
mi_tld_t tld;
mi_memid_t memid;
mi_memid_t memid; // must come last due to zero'ing
} mi_thread_data_t;
@ -231,7 +231,7 @@ static mi_thread_data_t* mi_thread_data_zalloc(void) {
}
if (td != NULL && !is_zero) {
_mi_memzero_aligned(td, sizeof(*td));
_mi_memzero_aligned(td, offsetof(mi_thread_data_t,memid));
}
return td;
}