Merged revisions 210575 via svnmerge from

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

........
  r210575 | rmudgett | 2009-08-05 14:18:56 -0500 (Wed, 05 Aug 2009) | 14 lines
  
  Dialplan starts execution before the channel setup is complete.
  
  *  Issue 15655: For the case where dialing is complete for an incoming
  call, dahdi_new() was asked to start the PBX and then the code set more
  channel variables.  If the dialplan hungup before these channel variables
  got set, asterisk would likely crash.
  *  Fixed potential for overlap incoming call to erroneously set channel
  variables as global dialplan variables if the ast_channel structure failed
  to get allocated.
  *  Added missing set of CALLINGSUBADDR in the dialing is complete case.
  
  (closes issue #15655)
  Reported by: alecdavis
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@210640 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/sig_pri.c

@@ -1227,11 +1227,9 @@ static void *pri_dchannel(void *vpri)
 							 * so other threads can send D channel messages.
 							 */
 							ast_mutex_unlock(&pri->lock);
-
 							c = sig_pri_new_ast_channel(pri->pvts[chanpos], AST_STATE_RESERVED, 0, (e->ring.layer1 = PRI_LAYER_1_ALAW) ? SIG_PRI_ALAW : SIG_PRI_ULAW, e->ring.ctype, pri->pvts[chanpos]->exten, NULL);
-
+							ast_mutex_lock(&pri->lock);
-							sig_pri_unlock_private(pri->pvts[chanpos]);
+							if (c) {
-
 								if (!ast_strlen_zero(e->ring.callingsubaddr)) {
 									pbx_builtin_setvar_helper(c, "CALLINGSUBADDR", e->ring.callingsubaddr);
 								}
@@ -1253,10 +1251,7 @@ static void *pri_dchannel(void *vpri)
 #if defined(HAVE_PRI_REVERSE_CHARGE)
 								pri->pvts[chanpos]->reverse_charging_indication = e->ring.reversecharge;
 #endif
-
+							}
-							sig_pri_lock_private(pri->pvts[chanpos]);
-							ast_mutex_lock(&pri->lock);
-
 							pthread_attr_init(&attr);
 							pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 							if (c && !ast_pthread_create(&threadid, &attr, pri_ss_thread, pri->pvts[chanpos])) {
@@ -1280,11 +1275,20 @@ static void *pri_dchannel(void *vpri)
 							 * so other threads can send D channel messages.
 							 */
 							ast_mutex_unlock(&pri->lock);
-							c = sig_pri_new_ast_channel(pri->pvts[chanpos], AST_STATE_RING, 1, (e->ring.layer1 == PRI_LAYER_1_ALAW) ? SIG_PRI_ALAW : SIG_PRI_ULAW, e->ring.ctype, pri->pvts[chanpos]->exten, NULL);
+							c = sig_pri_new_ast_channel(pri->pvts[chanpos], AST_STATE_RING, 0, (e->ring.layer1 == PRI_LAYER_1_ALAW) ? SIG_PRI_ALAW : SIG_PRI_ULAW, e->ring.ctype, pri->pvts[chanpos]->exten, NULL);
-
+							ast_mutex_lock(&pri->lock);
 							if (c) {
-								sig_pri_unlock_private(pri->pvts[chanpos]);
+								/*
-
+								 * It is reasonably safe to set the following
+								 * channel variables while the PRI and DAHDI private
+								 * structures are locked.  The PBX has not been
+								 * started yet and it is unlikely that any other task
+								 * will do anything with the channel we have just
+								 * created.
+								 */
+								if (!ast_strlen_zero(e->ring.callingsubaddr)) {
+									pbx_builtin_setvar_helper(c, "CALLINGSUBADDR", e->ring.callingsubaddr);
+								}
 								if (e->ring.ani2 >= 0) {
 									snprintf(ani2str, sizeof(ani2str), "%d", e->ring.ani2);
 									pbx_builtin_setvar_helper(c, "ANI2", ani2str);
@@ -1304,24 +1308,23 @@ static void *pri_dchannel(void *vpri)
 
 								snprintf(calledtonstr, sizeof(calledtonstr), "%d", e->ring.calledplan);
 								pbx_builtin_setvar_helper(c, "CALLEDTON", calledtonstr);
-
+							}
-								sig_pri_lock_private(pri->pvts[chanpos]);
+							if (c && !ast_pbx_start(c)) {
-								ast_mutex_lock(&pri->lock);
-
 								ast_verb(3, "Accepting call from '%s' to '%s' on channel %d/%d, span %d\n",
 									plancallingnum, pri->pvts[chanpos]->exten,
 									pri->pvts[chanpos]->logicalspan, pri->pvts[chanpos]->prioffset, pri->span);
 								sig_pri_set_echocanceller(pri->pvts[chanpos], 1);
 							} else {
-
-								ast_mutex_lock(&pri->lock);
-
 								ast_log(LOG_WARNING, "Unable to start PBX on channel %d/%d, span %d\n",
 									pri->pvts[chanpos]->logicalspan, pri->pvts[chanpos]->prioffset, pri->span);
+								if (c) {
+									ast_hangup(c);
+								} else {
 									pri_hangup(pri->pri, e->ring.call, PRI_CAUSE_SWITCH_CONGESTION);
 									pri->pvts[chanpos]->call = NULL;
 								}
 							}
+						}
 					} else {
 						ast_verb(3, "Extension '%s' in context '%s' from '%s' does not exist.  Rejecting call on channel %d/%d, span %d\n",
 							pri->pvts[chanpos]->exten, pri->pvts[chanpos]->context, pri->pvts[chanpos]->cid_num, pri->pvts[chanpos]->logicalspan,