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Add two checks for zend_mm_heap's integrity (#13943)
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@ -1065,6 +1065,9 @@ get_chunk:
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found:
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if (steps > 2 && pages_count < 8) {
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ZEND_MM_CHECK(chunk->next->prev == chunk, "zend_mm_heap corrupted");
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ZEND_MM_CHECK(chunk->prev->next == chunk, "zend_mm_heap corrupted");
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/* move chunk into the head of the linked-list */
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chunk->prev->next = chunk->next;
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chunk->next->prev = chunk->prev;
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@ -1116,6 +1119,9 @@ static zend_never_inline void *zend_mm_alloc_large(zend_mm_heap *heap, size_t si
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static zend_always_inline void zend_mm_delete_chunk(zend_mm_heap *heap, zend_mm_chunk *chunk)
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{
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ZEND_MM_CHECK(chunk->next->prev == chunk, "zend_mm_heap corrupted");
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ZEND_MM_CHECK(chunk->prev->next == chunk, "zend_mm_heap corrupted");
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chunk->next->prev = chunk->prev;
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chunk->prev->next = chunk->next;
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heap->chunks_count--;
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