Merged revisions 320057 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r320057 | rmudgett | 2011-05-20 11:43:02 -0500 (Fri, 20 May 2011) | 19 lines
  
  Crash while transferring a call during DTMF feature timeout.
  
  When a call is being attended transferred during the time between
  AST_FRAME_DTMF_BEGIN and AST_FRAME_DTMF_END, the transferred channel
  becomes a zombie (so tech data is not available), making ast_dtmf_stream()
  segfault when it tries to send the DTMF digit (at least with SIP
  channels).
  
  Patch based on feature-end-zombie.patch uploaded by Irontec (license 1256)
  
  * Check for zombies when ast_channel_bridge() returns.
  
  * Guarantee that the fo parameter value is initialized in
  ast_channel_bridge() before any returns.
  
  (closes issue #19116)
  Reported by: Irontec
  Tested by: rmudgett
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@320058 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -7272,6 +7272,8 @@ enum ast_bridge_result ast_channel_bridge(struct ast_channel *c0, struct ast_cha
 	char caller_warning = 0;
 	char callee_warning = 0;
 
+	*fo = NULL;
+
 	if (c0->_bridge) {
 		ast_log(LOG_WARNING, "%s is already in a bridge with %s\n",
 			c0->name, c0->_bridge->name);
@@ -7297,9 +7299,6 @@ enum ast_bridge_result ast_channel_bridge(struct ast_channel *c0, struct ast_cha
 		return -1;
 	}
 
-
-	*fo = NULL;
-
 	if (ast_tvzero(config->start_time)) {
 		config->start_time = ast_tvnow();
 		if (config->start_sound) {

main/features.c

@@ -3660,7 +3660,17 @@ int ast_bridge_call(struct ast_channel *chan,struct ast_channel *peer,struct ast
 		struct ast_channel *other;	/* used later */
 	
 		res = ast_channel_bridge(chan, peer, config, &f, &who);
-		
+
+		if (ast_test_flag(chan, AST_FLAG_ZOMBIE)
+			|| ast_test_flag(peer, AST_FLAG_ZOMBIE)) {
+			/* Zombies are present time to leave! */
+			res = -1;
+			if (f) {
+				ast_frfree(f);
+			}
+			goto before_you_go;
+		}
+
 		/* When frame is not set, we are probably involved in a situation
 		   where we've timed out.
 		   When frame is set, we'll come this code twice; once for DTMF_BEGIN