From: Mark Michelson <mmichelson@digium.com>
Date: Thu, 25 Jun 2009 18:52:22 +0000 (+0000)
Subject: Prevent false positives when freeing a NULL pointer with MALLOC_DEBUG enabled.
X-Git-Tag: 1.4.26~39
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=140d84dfc550234541cdac8351e1c92cf982e992;p=thirdparty%2Fasterisk.git

Prevent false positives when freeing a NULL pointer with MALLOC_DEBUG enabled.



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@203230 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---

diff --git a/main/astmm.c b/main/astmm.c
index b0eb51bf58..8dd5edd3fb 100644
--- a/main/astmm.c
+++ b/main/astmm.c
@@ -157,10 +157,16 @@ static inline size_t __ast_sizeof_region(void *ptr)
 
 static void __ast_free_region(void *ptr, const char *file, int lineno, const char *func)
 {
-	int hash = HASH(ptr);
+	int hash;
 	struct ast_region *reg, *prev = NULL;
 	unsigned int *fence;
 
+	if (!ptr) {
+		return;
+	}
+
+	hash = HASH(ptr);
+
 	ast_mutex_lock(&reglock);
 	for (reg = regions[hash]; reg; reg = reg->next) {
 		if (reg->data == ptr) {