Fix a potential memory leak of the local_pvt struct when ast_channel allocation

fails.  Also, in passing, centralize the code necessary to destroy a local_pvt.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@105568 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_local.c

@@ -150,6 +150,13 @@ static int local_devicestate(void *data)
 		return AST_DEVICE_UNKNOWN;
 }
 
+static struct local_pvt *local_pvt_destroy(struct local_pvt *pvt)
+{
+	ast_mutex_destroy(&pvt->lock);
+	free(pvt);
+	return NULL;
+}
+
 static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_frame *f, struct ast_channel *us)
 {
 	struct ast_channel *other = NULL;
@@ -163,8 +170,7 @@ static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_fra
 		/* We had a glare on the hangup.  Forget all this business,
 		return and destroy p.  */
 		ast_mutex_unlock(&p->lock);
-		ast_mutex_destroy(&p->lock);
-		free(p);
+		p = local_pvt_destroy(p);
 		return -1;
 	}
 	if (!other) {
@@ -540,8 +546,7 @@ static int local_hangup(struct ast_channel *ast)
 		ast_mutex_unlock(&p->lock);
 		/* And destroy */
 		if (!glaredetect) {
-			ast_mutex_destroy(&p->lock);
-			free(p);
+			p = local_pvt_destroy(p);
 		}
 		return 0;
 	}
@@ -587,9 +592,7 @@ static struct local_pvt *local_alloc(const char *data, int format)
 
 	if (!ast_exists_extension(NULL, tmp->context, tmp->exten, 1, NULL)) {
 		ast_log(LOG_NOTICE, "No such extension/context %s@%s creating local channel\n", tmp->exten, tmp->context);
-		ast_mutex_destroy(&tmp->lock);
-		free(tmp);
-		tmp = NULL;
+		tmp = local_pvt_destroy(tmp);
 	} else {
 		/* Add to list */
 		AST_LIST_LOCK(&locals);
@@ -662,7 +665,6 @@ static struct ast_channel *local_new(struct local_pvt *p, int state)
 	return tmp;
 }
 
-
 /*! \brief Part of PBX interface */
 static struct ast_channel *local_request(const char *type, int format, void *data, int *cause)
 {
@@ -670,8 +672,10 @@ static struct ast_channel *local_request(const char *type, int format, void *dat
 	struct ast_channel *chan = NULL;
 
 	/* Allocate a new private structure and then Asterisk channel */
-	if ((p = local_alloc(data, format)))
-		chan = local_new(p, AST_STATE_DOWN);
+	if ((p = local_alloc(data, format))) {
+		if (!(chan = local_new(p, AST_STATE_DOWN)))
+			p = local_pvt_destroy(p);
+	}
 
 	return chan;
 }