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 d77d4630d3e3d5f3338e118e6376adcc964cc2ac..3d1d8503978c0da1cfbb025ae33785fa50784d39 100644 (file)
--- 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;
        }