ovsdb: Fix ovsdb-server crash when specifying nonexistent file.

ovsdb_file_open__() can call (NULL) in its error exit
path, but ovsdb_schema_destroy() didn't tolerate a null pointer argument.

Bug #2538.

diff --git a/ovsdb/ovsdb.c b/ovsdb/ovsdb.c
index 5bbaddb..4568376 100644 (file)
--- a/ovsdb/ovsdb.c
+++ b/ovsdb/ovsdb.c
@@ -58,6 +58,10 @@ ovsdb_schema_destroy(struct ovsdb_schema *schema)
 {
     struct shash_node *node;
 
+    if (!schema) {
+        return;
+    }
+
     SHASH_FOR_EACH (node, &schema->tables) {
         ovsdb_table_schema_destroy(node->data);
     }