It's possible for a hangup to be received, even just after the initial cid

spill.
(closes issue #12453)
 Reported by: Alex728
 Patches:
       20080604__bug12453.diff.txt uploaded by Corydon76 (license 14)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@124182 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_dahdi.c b/channels/chan_dahdi.c
index c03981dd58d9b0d9980273ef529a465e285ae71b..49f9d3e7110c1e15ee6f95cea462fb73a6dded6e 100644 (file)
--- a/channels/chan_dahdi.c
+++ b/channels/chan_dahdi.c
@@ -6252,7 +6252,11 @@ static void *ss_thread(void *data)
                                                        ast_hangup(chan);
                                                        return NULL;
                                                } 
-                                               f = ast_read(chan);
+                                               if (!(f = ast_read(chan))) {
+                                                       ast_log(LOG_WARNING, "Hangup received waiting for ring. Exiting simple switch\n");
+                                                       ast_hangup(chan);
+                                                       return NULL;
+                                               }
                                                ast_frfree(f);
                                                if (chan->_state == AST_STATE_RING ||
                                                    chan->_state == AST_STATE_RINGING)