Merged revisions 80132 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r80132 | russell | 2007-08-21 10:22:22 -0500 (Tue, 21 Aug 2007) | 3 lines

Don't try to dereference the owner channel when it may not exist
(issue #10507, maxper)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@80133 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_mgcp.c

@@ -3200,19 +3200,16 @@ static int handle_request(struct mgcp_subchannel *sub, struct mgcp_request *req,
 				(((ev[0] >= '0') && (ev[0] <= '9')) ||
 				 ((ev[0] >= 'A') && (ev[0] <= 'D')) ||
 				  (ev[0] == '*') || (ev[0] == '#'))) {
-			if (sub && (sub->owner->_state >=  AST_STATE_UP)) {
+			if (sub && sub->owner && (sub->owner->_state >=  AST_STATE_UP)) {
 				f.frametype = AST_FRAME_DTMF;
 				f.subclass = ev[0];
 				f.src = "mgcp";
-				if (sub->owner) {
+				/* XXX MUST queue this frame to all subs in threeway call if threeway call is active */
-					/* XXX MUST queue this frame to all subs in threeway call if threeway call is active */
+				mgcp_queue_frame(sub, &f);
-					mgcp_queue_frame(sub, &f);
+				ast_mutex_lock(&sub->next->lock);
-					ast_mutex_lock(&sub->next->lock);
+				if (sub->next->owner)
-					if (sub->next->owner) {
+					mgcp_queue_frame(sub->next, &f);
-						mgcp_queue_frame(sub->next, &f);
+				ast_mutex_unlock(&sub->next->lock);
-					}
-					ast_mutex_unlock(&sub->next->lock);
-				}
 				if (strstr(p->curtone, "wt") && (ev[0] == 'A')) {
 					memset(p->curtone, 0, sizeof(p->curtone));
 				}