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chan_mgcp: Properly handle malformed media lines

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This corrects a situation in which a media line was not parsed properly
and resulted in a crash.

(closes issue ASTERISK-21190)
Reported by: adomjan
Patches:
    chan_mgcp.c-sscnaf_fix uploaded by adomjan (License 5448)
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Merged revisions 401537 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 401538 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 401539 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@401540 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kinsey Moore
2013-10-23 15:23:58 +00:00
parent f4e028a765
commit dfd3f4ef46
1 changed files with 3 additions and 3 deletions
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6
channels/chan_mgcp.c
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@@ -1971,7 +1971,7 @@ static int process_sdp(struct mgcp_subchannel *sub, struct mgcp_request *req)
char *c;
char *a;
char host[258];
int len;
int len = 0;
int portno;
struct ast_format_cap *peercap;
int peerNonCodecCapability;
@@ -2001,8 +2001,8 @@ static int process_sdp(struct mgcp_subchannel *sub, struct mgcp_request *req)
ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c);
return -1;
}
if (sscanf(m, "audio %30d RTP/AVP %n", &portno, &len) != 1) {
ast_log(LOG_WARNING, "Unable to determine port number for RTP in '%s'\n", m);
if (sscanf(m, "audio %30d RTP/AVP %n", &portno, &len) != 1 || !len) {
ast_log(LOG_WARNING, "Malformed media stream descriptor: %s\n", m);
return -1;
}
sin.sin_family = AF_INET;