auth: ldap - Make sure ldap log prefix doesn't contain (null)

This could have happened with invalid ldap_uris.

diff --git a/src/auth/db-ldap.c b/src/auth/db-ldap.c
index 9e0bc14d1d0aa455c4c2c727b026a6ebbbced580..e71f115e187129bfe3396159fc955ddea3fd91c3 100644 (file)
--- a/src/auth/db-ldap.c
+++ b/src/auth/db-ldap.c
@@ -781,7 +781,9 @@ db_ldap_add_connection_callback(LDAP *ld ATTR_UNUSED, Sockbuf *sb ATTR_UNUSED,
 {
        struct ldap_connection *conn = ctx->lc_arg;
        const char *prefix = t_strdup_printf("ldap(%s://%s:%d): ",
-               srv->lud_scheme, srv->lud_host, srv->lud_port);
+               srv->lud_scheme != NULL ? srv->lud_scheme : "",
+               srv->lud_host != NULL ? srv->lud_host : "",
+               srv->lud_port);
 
        if (strcmp(conn->log_prefix, prefix) != 0) {
                i_free(conn->log_prefix);