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define MI_MAX_ALLOC_SIZE as PTRDIFF_MAX (related to #877)

This commit is contained in:
Daan 2024-04-19 09:53:21 -07:00
parent 06b510c42d
commit 5050b63038
2 changed files with 3 additions and 1 deletions
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2
include/mimalloc/types.h
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@ -195,6 +195,8 @@ typedef int32_t mi_ssize_t;
// Alignments over MI_BLOCK_ALIGNMENT_MAX are allocated in dedicated huge page segments
#define MI_BLOCK_ALIGNMENT_MAX (MI_SEGMENT_SIZE >> 1)
// we never allocate more than PTRDIFF_MAX (see also <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
#define MI_MAX_ALLOC_SIZE PTRDIFF_MAX
// ------------------------------------------------------
// Mimalloc pages contain allocated blocks

2
src/page.c
View File

@ -857,7 +857,7 @@ static mi_page_t* mi_find_page(mi_heap_t* heap, size_t size, size_t huge_alignme
// huge allocation?
const size_t req_size = size - MI_PADDING_SIZE; // correct for padding_size in case of an overflow on `size`
if mi_unlikely(req_size > (MI_LARGE_OBJ_SIZE_MAX - MI_PADDING_SIZE) || huge_alignment > 0) {
if mi_unlikely(req_size > PTRDIFF_MAX) { // we don't allocate more than PTRDIFF_MAX (see <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
if mi_unlikely(req_size > MI_MAX_ALLOC_SIZE) {
_mi_error_message(EOVERFLOW, "allocation request is too large (%zu bytes)\n", req_size);
return NULL;
}