From 6f02a831024dec1f687cfe1b6bd2b49f2232082b Mon Sep 17 00:00:00 2001
From: Nicolas Thill <nico@openwrt.org>
Date: Fri, 10 Apr 2009 11:53:12 +0000
Subject: [PATCH] [CVE-2009-0871] fix remote crash vulnerability in Asterisk
 SIP channel driver (closes: #4910)

SVN-Revision: 15188
---
 .../patches/901-cve-2009-0871.patch           | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 net/asterisk-1.4.x/patches/901-cve-2009-0871.patch

diff --git a/net/asterisk-1.4.x/patches/901-cve-2009-0871.patch b/net/asterisk-1.4.x/patches/901-cve-2009-0871.patch
new file mode 100644
index 0000000000..bd478ac287
--- /dev/null
+++ b/net/asterisk-1.4.x/patches/901-cve-2009-0871.patch
@@ -0,0 +1,70 @@
+http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0871
+
+--- a/channels/chan_sip.c
++++ b/channels/chan_sip.c
+@@ -13917,19 +13917,32 @@ static int handle_invite_replaces(struct
+  */
+ static int sip_uri_params_cmp(const char *input1, const char *input2) 
+ {
+-	char *params1 = ast_strdupa(input1);
+-	char *params2 = ast_strdupa(input2);
++	char *params1 = NULL;
++	char *params2 = NULL;
+ 	char *pos1;
+ 	char *pos2;
++	int zerolength1 = 0;
++	int zerolength2 = 0;
+ 	int maddrmatch = 0;
+ 	int ttlmatch = 0;
+ 	int usermatch = 0;
+ 	int methodmatch = 0;
+ 
++	if (ast_strlen_zero(input1)) {
++		zerolength1 = 1;
++	} else {
++		params1 = ast_strdupa(input1);
++	}
++	if (ast_strlen_zero(input2)) {
++		zerolength2 = 1;
++	} else {
++		params2 = ast_strdupa(input2);
++	}
++
+ 	/*Quick optimization. If both params are zero-length, then
+ 	 * they match
+ 	 */
+-	if (ast_strlen_zero(params1) && ast_strlen_zero(params2)) {
++	if (zerolength1 && zerolength2) {
+ 		return 0;
+ 	}
+ 
+@@ -14044,13 +14057,25 @@ fail:
+  */
+ static int sip_uri_headers_cmp(const char *input1, const char *input2)
+ {
+-	char *headers1 = ast_strdupa(input1);
+-	char *headers2 = ast_strdupa(input2);
+-	int zerolength1 = ast_strlen_zero(headers1);
+-	int zerolength2 = ast_strlen_zero(headers2);
++	char *headers1 = NULL;
++	char *headers2 = NULL;
++	int zerolength1 = 0;
++	int zerolength2 = 0;
+ 	int different = 0;
+ 	char *header1;
+ 
++	if (ast_strlen_zero(input1)) {
++		zerolength1 = 1;
++	} else {
++		headers1 = ast_strdupa(input1);
++	}
++	
++	if (ast_strlen_zero(input2)) {
++		zerolength2 = 1;
++	} else {
++		headers2 = ast_strdupa(input2);
++	}
++
+ 	if ((zerolength1 && !zerolength2) ||
+ 			(zerolength2 && !zerolength1))
+ 		return 1;
-- 
2.30.2