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fix overflow of slice count, PR #877

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Daan 2024-04-19 10:03:14 -07:00
commit 78418b3d24
5 changed files with 15 additions and 3 deletions
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8
include/mimalloc/types.h
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@ -205,6 +205,14 @@ typedef int32_t mi_ssize_t;
// Maximum slice count (255) for which we can find the page for interior pointers
#define MI_MAX_SLICE_OFFSET_COUNT ((MI_BLOCK_ALIGNMENT_MAX / MI_SEGMENT_SLICE_SIZE) - 1)
// we never allocate more than PTRDIFF_MAX (see also <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
// on 64-bit+ systems we also limit the maximum allocation size such that the slice count fits in 32-bits. (issue #877)
#if PTRDIFF_MAX >= (MI_SEGMENT_SLIZE_SIZE * UINT32_MAX)
#define MI_MAX_ALLOC_SIZE (MI_SEGMENT_SLICE_SIZE * (UINT32_MAX-1))
#else
#define MI_MAX_ALLOC_SIZE PTRDIFF_MAX
#endif
// ------------------------------------------------------
// Mimalloc pages contain allocated blocks