chan_pjsip: Creating Channel Causes Asterisk to Crash When Duplicate AOR

            Sections Exist in pjsip.conf

This patch modifies the current loading strategy of the pjsip configuration. If
duplicate sections (e.g. sections containing the same [id/type]) are defined in
[pjsip.conf], the loader will consider the configuration for the given type as
invalid when the duplicate section is encountered. The entire configuration
(including what was previously loaded) for the duplicate [id/type] sections
will be rejected and destroyed, an error message is logged and the load
processing for the given stops.

ASTERISK-24996
Reported By: Ashley Sanders

Change-Id: I35090ca4cd40f1f34881dfe701a329145c347aef

res/res_sorcery_config.c

@@ -294,6 +294,18 @@ static void sorcery_config_internal_load(void *data, const struct ast_sorcery *s
 			continue;
 		}
 
+		/*  Confirm an object with this id does not already exist in the bucket.
+		 *  If it exists, however, the configuration is invalid so stop
+		 *  processing and destroy it. */
+		obj = ao2_find(objects, id, OBJ_KEY;
+
+		if (obj) {
+			ast_log(LOG_ERROR, "Config file '%s' could not be loaded; configuration contains a duplicate object: '%s' of type '%s'\n",
+				config->filename, id, type);
+			ast_config_destroy(cfg);
+			return;
+		}
+
 		if (!(obj = ast_sorcery_alloc(sorcery, type, id)) ||
 		    ast_sorcery_objectset_apply(sorcery, obj, ast_category_first(category))) {