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don't allocate more than PTRDIFF_MAX on aligned allocations

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daan 2019-09-07 11:52:21 -07:00
parent f2f7c8d0e9
commit b241910810
1 changed files with 1 additions and 1 deletions
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src/alloc-aligned.c
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@ -19,7 +19,7 @@ static void* mi_heap_malloc_zero_aligned_at(mi_heap_t* heap, size_t size, size_t
// the address at offset is aligned regardless of the allocated size. // the address at offset is aligned regardless of the allocated size.
mi_assert(alignment > 0 && alignment % sizeof(uintptr_t) == 0); mi_assert(alignment > 0 && alignment % sizeof(uintptr_t) == 0);
if (alignment <= sizeof(uintptr_t)) return _mi_heap_malloc_zero(heap,size,zero); if (alignment <= sizeof(uintptr_t)) return _mi_heap_malloc_zero(heap,size,zero);
if (size >= (SIZE_MAX - alignment)) return NULL; // overflow if (mi_unlikely(size > PTRDIFF_MAX)) return NULL; // we don't allocate more than PTRDIFF_MAX (see <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
// try if there is a current small block with just the right alignment // try if there is a current small block with just the right alignment
if (size <= MI_SMALL_SIZE_MAX) { if (size <= MI_SMALL_SIZE_MAX) {