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

diff --git a/channels/chan_local.c b/channels/chan_local.c
index 5a8d6f002d78b0857ac9b8361e7c632796a22c71..93989acdba75fc3e7ea2dbf271407b102adf033b 100644 (file)
--- a/channels/chan_local.c
+++ b/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;
 }