From: Alexander Traud <pabstraud@compuserve.com>
Date: Wed, 29 Mar 2017 13:04:05 +0000 (+0200)
Subject: srtp: Allow zero as tag value for a sRTP Crypto Suite.
X-Git-Tag: 14.5.0-rc1~72^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60ff37fcb8b9154027d9e0c6d82b9446a989054e;p=thirdparty%2Fasterisk.git

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

ASTERISK-25490 #close

Change-Id: I1c5fc0942c33c96d62b24203aad0f1e1a1a0131f
---

diff --git a/res/res_srtp.c b/res/res_srtp.c
index 1fb16ce6b9..dfe67c9207 100644
--- a/res/res_srtp.c
+++ b/res/res_srtp.c
@@ -784,8 +784,8 @@ static int res_sdp_crypto_parse_offer(struct ast_rtp_instance *rtp, struct ast_s
 		return -1;
 	}
 
-	/* RFC4568 9.1 - tag is 1-9 digits, greater than zero */
-	if (sscanf(tag, "%30d", &tag_from_sdp) != 1 || tag_from_sdp <= 0 || tag_from_sdp > 999999999) {
+	/* RFC4568 9.1 - tag is 1-9 digits */
+	if (sscanf(tag, "%30d", &tag_from_sdp) != 1 || tag_from_sdp < 0 || tag_from_sdp > 999999999) {
 		ast_log(LOG_WARNING, "Unacceptable a=crypto tag: %s\n", tag);
 		return -1;
 	}