auth: Avoid a crash by not trying to save empty delayed credentials.

diff --git a/src/auth/auth-request.c b/src/auth/auth-request.c
index 344d45a606b6bb226c22376c96d88e8a9e97a8fe..95dfe1e44b323006f1389edeaf760ef12ae6e80c 100644 (file)
--- a/src/auth/auth-request.c
+++ b/src/auth/auth-request.c
@@ -810,7 +810,7 @@ auth_request_lookup_credentials_finish(enum passdb_result result,
        if (!auth_request_handle_passdb_callback(&result, request)) {
                /* try next passdb */
                if (request->skip_password_check &&
-                   request->delayed_credentials == NULL) {
+                   request->delayed_credentials == NULL && size > 0) {
                        /* passdb continue* rule after a successful lookup.
                           remember these credentials and use them later on. */
                        unsigned char *dup;