--- a/src/backend/commands/user.c
+++ b/src/backend/commands/user.c
@@ -2566,6 +2566,8 @@ check_createrole_self_grant(char **newval, void **extra, GucSource source)
        list_free(elemlist);

        result = (unsigned *) guc_malloc(LOG, sizeof(unsigned));
+       if (!result)
+               return false;
        *result = options;
        *extra = result;