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fix possible underflow (issue #731)

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daanx 2023-04-21 09:37:05 -07:00
parent b549c88e6c
commit 4cb5b45178
1 changed files with 6 additions and 3 deletions
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5
src/segment.c
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@ -1273,10 +1273,13 @@ void _mi_segment_huge_page_reset(mi_segment_t* segment, mi_page_t* page, mi_bloc
mi_assert_internal(page->used == 1); // this is called just before the free mi_assert_internal(page->used == 1); // this is called just before the free
mi_assert_internal(page->free == NULL); mi_assert_internal(page->free == NULL);
if (segment->allow_decommit && page->is_committed) { if (segment->allow_decommit && page->is_committed) {
const size_t usize = mi_usable_size(block) - sizeof(mi_block_t); size_t usize = mi_usable_size(block);
if (usize > sizeof(mi_block_t)) {
usize = usize - sizeof(mi_block_t);
uint8_t* p = (uint8_t*)block + sizeof(mi_block_t); uint8_t* p = (uint8_t*)block + sizeof(mi_block_t);
_mi_os_reset(p, usize, &_mi_stats_main); _mi_os_reset(p, usize, &_mi_stats_main);
} }
}
} }
#endif #endif