Merged revisions 169210 via svnmerge from

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

........
r169210 | mmichelson | 2009-01-19 09:52:15 -0600 (Mon, 19 Jan 2009) | 13 lines

Prevent a crash in chan_local due to a potential NULL pointer dereference

Move the check for if both channels on a local_pvt have generators to below
where p->chan is checked for NULLity (NULLness?). This prevents a crash from
occurring if p->chan is NULL.

(closes issue #14189)
Reported by: sascha
Patches:
      14189.patch uploaded by putnopvut (license 60)
Tested by: sascha


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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@169211 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_local.c

@@ -203,10 +203,6 @@ static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_fra
 	/* Recalculate outbound channel */
 	other = isoutbound ? p->owner : p->chan;
 
-	/* do not queue frame if generator is on both local channels */
-	if (us && us->generator && other->generator)
-		return 0;
-
 	/* Set glare detection */
 	ast_set_flag(p, LOCAL_GLARE_DETECT);
 	if (ast_test_flag(p, LOCAL_CANCEL_QUEUE)) {
@@ -221,6 +217,10 @@ static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_fra
 		return 0;
 	}
 
+	/* do not queue frame if generator is on both local channels */
+	if (us && us->generator && other->generator)
+		return 0;
+
 	/* Ensure that we have both channels locked */
 	while (other && ast_channel_trylock(other)) {
 		ast_mutex_unlock(&p->lock);