From 521485c8f25f55cb3045ab2b33232c7026d8527d Mon Sep 17 00:00:00 2001
From: Daniel-Constantin Mierla <miconda@gmail.com>
Date: Tue, 15 Jun 2021 09:54:32 +0200
Subject: [PATCH] nathelper: check length on new condition inside
 replace_sdp_ip()

---
 src/modules/nathelper/nathelper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/modules/nathelper/nathelper.c b/src/modules/nathelper/nathelper.c
index 5fb83cea462..df9a5bce2ca 100644
--- a/src/modules/nathelper/nathelper.c
+++ b/src/modules/nathelper/nathelper.c
@@ -1696,7 +1696,7 @@ static inline int replace_sdp_ip(
 		hasreplaced = 1;
 		body1 = body2;
 	}
-	if(!hasreplaced && memcmp("a=rtcp", line, 6) != 0) {
+	if(!hasreplaced && linelen>=6 && memcmp("a=rtcp", line, 6)!=0) {
 		LM_ERR("can't extract '%s' IP from the SDP\n", line);
 		return -1;
 	}