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fix ubsan warning on huge allocations (issue #543)

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daan 2022-02-10 11:57:30 -08:00
parent 352d8be237
commit 96008c55d0
1 changed files with 2 additions and 1 deletions
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3
src/segment.c
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@ -762,7 +762,8 @@ static mi_page_t* mi_segment_span_allocate(mi_segment_t* segment, size_t slice_i
}
// and also for the last one (if not set already) (the last one is needed for coalescing)
mi_slice_t* last = &segment->slices[slice_index + slice_count - 1];
// note: the cast is needed for ubsan since the index can be larger than MI_SLICES_PER_SEGMENT for huge allocations (see #543)
mi_slice_t* last = &((mi_slice_t*)segment->slices)[slice_index + slice_count - 1];
if (last < mi_segment_slices_end(segment) && last >= slice) {
last->slice_offset = (uint32_t)(sizeof(mi_slice_t)*(slice_count-1));
last->slice_count = 0;