From: Alexander Traud <pabstraud@compuserve.com>
Date: Wed, 29 Mar 2017 13:27:01 +0000 (+0200)
Subject: srtp: Allow zero as tag value for a sRTP Crypto Suite.
X-Git-Tag: 13.16.0-rc1~72^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef19db92615f8f29604e0df2ec78036bd003cdfa;p=thirdparty%2Fasterisk.git

srtp: Allow zero as tag value for a sRTP Crypto Suite.

ASTERISK-25490 #close

Change-Id: I1c5fc0942c33c96d62b24203aad0f1e1a1a0131f
---

diff --git a/main/sdp_srtp.c b/main/sdp_srtp.c
index d77d4630d3..3d1d850397 100644
--- a/main/sdp_srtp.c
+++ b/main/sdp_srtp.c
@@ -238,8 +238,8 @@ int ast_sdp_crypto_process(struct ast_rtp_instance *rtp, struct ast_sdp_srtp *sr
 		return -1;
 	}
 
-	/* RFC4568 9.1 - tag is 1-9 digits, greater than zero */
-	if (sscanf(tag, "%30d", &crypto->tag) != 1 || crypto->tag <= 0 || crypto->tag > 999999999) {
+	/* RFC4568 9.1 - tag is 1-9 digits */
+	if (sscanf(tag, "%30d", &crypto->tag) != 1 || crypto->tag < 0 || crypto->tag > 999999999) {
 		ast_log(LOG_WARNING, "Unacceptable a=crypto tag: %s\n", tag);
 		return -1;
 	}