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comparison src/core/ngx_slab.c @ 6809:87d7e640b45d

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Slab: improved double free detection. Previously, an attempt to double free the starting page of the free range was not detected.
author Ruslan Ermilov <ru@nginx.com>
date Sat, 03 Dec 2016 10:01:39 +0300
parents 2af776c22aec
children 88c8c3d65184
comparison
equal deleted inserted replaced
6808:2af776c22aec 6809:87d7e640b45d
595 595
596 if ((uintptr_t) p & (ngx_pagesize - 1)) { 596 if ((uintptr_t) p & (ngx_pagesize - 1)) {
597 goto wrong_chunk; 597 goto wrong_chunk;
598 } 598 }
599 599
600 if (slab == NGX_SLAB_PAGE_FREE) { 600 if (!(slab & NGX_SLAB_PAGE_START)) {
601 ngx_slab_error(pool, NGX_LOG_ALERT, 601 ngx_slab_error(pool, NGX_LOG_ALERT,
602 "ngx_slab_free(): page is already free"); 602 "ngx_slab_free(): page is already free");
603 goto fail; 603 goto fail;
604 } 604 }
605 605