From: Willy Tarreau <w@1wt.eu>
Date: Fri, 15 Nov 2019 05:59:54 +0000 (+0100)
Subject: MINOR: memory: also poison the area on freeing
X-Git-Tag: v2.1-dev5~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da52035a45;p=thirdparty%2Fhaproxy.git

MINOR: memory: also poison the area on freeing

Doing so sometimes helps detect some UAF situations without the overhead
associated to the DEBUG_UAF define.
---

diff --git a/include/common/memory.h b/include/common/memory.h
index ae1ad22977..1aab6d460b 100644
--- a/include/common/memory.h
+++ b/include/common/memory.h
@@ -332,6 +332,8 @@ static inline void pool_free(struct pool_head *pool, void *ptr)
 		if (*POOL_LINK(pool, ptr) != (void *)pool)
 			*(volatile int *)0 = 0;
 #endif
+		if (mem_poison_byte >= 0)
+			memset(ptr, mem_poison_byte, pool->size);
 		pool_put_to_cache(pool, ptr);
 	}
 }