Don't return a partially initialized datastore.

If memory allocation fails in ast_strdup(), don't return a partially
initialized datastore.  Bad things may happen.

(related to ABE-2415)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@273565 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -1439,7 +1439,10 @@ struct ast_datastore *ast_channel_datastore_alloc(const struct ast_datastore_inf
 
 	datastore->info = info;
 
-	datastore->uid = ast_strdup(uid);
+	if (!ast_strlen_zero(uid) && !(datastore->uid = ast_strdup(uid))) {
+		ast_free(datastore);
+		datastore = NULL;
+	}
 
 	return datastore;
 }