auth: Use default scheme in Lua passdb lookup

Fixes a null pointer crash.

diff --git a/src/auth/passdb-lua.c b/src/auth/passdb-lua.c
index 1c38658c0e6f6a5b94361500c47447f973eda2b1..3da00266972d0af58a20faa9a09527538ab3e918 100644 (file)
--- a/src/auth/passdb-lua.c
+++ b/src/auth/passdb-lua.c
@@ -55,6 +55,9 @@ passdb_lua_lookup(struct auth_request *request,
                        auth_request_log_info(request, AUTH_SUBSYS_DB,
                                "No password returned (and no nopassword)");
                        result = PASSDB_RESULT_PASSWORD_MISMATCH;
+               } else {
+                       if (*scheme_r == NULL)
+                               *scheme_r = request->passdb->passdb->default_pass_scheme;
                }
        } else if (*password_r != NULL && **password_r != '\0') {
                auth_request_log_info(request, AUTH_SUBSYS_DB,