Fixed possible failure

diff --git a/Zend/zend_alloc.c b/Zend/zend_alloc.c
index a25d9ada70d55b559d7d4d619b037d8998f5e758..090c12aca94336a29f403597c89abf00e6d5ad2a 100644 (file)
--- a/Zend/zend_alloc.c
+++ b/Zend/zend_alloc.c
@@ -557,15 +557,14 @@ static void zend_mm_free_cache(zend_mm_heap *heap)
                        while (mm_block) {
                                size_t size = ZEND_MM_BLOCK_SIZE(mm_block);
                                zend_mm_free_block *q = mm_block->prev_free_block;
-                               zend_mm_block *prev_block = ZEND_MM_PREV_BLOCK(mm_block);
                                zend_mm_block *next_block = ZEND_MM_NEXT_BLOCK(mm_block);
 
                                heap->cached -= size;
 
-                               if (ZEND_MM_IS_FREE_BLOCK(prev_block)) {
-                                       size += ZEND_MM_FREE_BLOCK_SIZE(prev_block);
-                                       mm_block = (zend_mm_free_block*)prev_block;
-                                       zend_mm_remove_from_free_list(heap, (zend_mm_free_block *) prev_block);
+                               if (ZEND_MM_PREV_BLOCK_IS_FREE(mm_block)) {
+                                       mm_block = (zend_mm_free_block*)ZEND_MM_PREV_BLOCK(mm_block);
+                                       size += ZEND_MM_FREE_BLOCK_SIZE(mm_block);
+                                       zend_mm_remove_from_free_list(heap, (zend_mm_free_block *) mm_block);
                                }
                                if (ZEND_MM_IS_FREE_BLOCK(next_block)) {
                                        size += ZEND_MM_FREE_BLOCK_SIZE(next_block);