upstream: fix sshbuf_dtourlb64() to not choke on empty buffers;

previously it incorrectly returned an error in this situation; ok deraadt

OpenBSD-Commit-ID: e62773d6e8cb95a19aab54f0af0edbcd47b345c0

diff --git a/sshbuf-misc.c b/sshbuf-misc.c
index bc92866db60a9cafa75c7ba29590954c80be423d..431809d906df0da3699e648d3774e8113cea7449 100644 (file)
--- a/sshbuf-misc.c
+++ b/sshbuf-misc.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: sshbuf-misc.c,v 1.21 2025/07/24 05:44:55 djm Exp $    */
+/*     $OpenBSD: sshbuf-misc.c,v 1.22 2025/09/04 00:32:31 djm Exp $    */
 /*
  * Copyright (c) 2011 Damien Miller
  *
@@ -212,6 +212,9 @@ sshbuf_dtourlb64(const struct sshbuf *d, struct sshbuf *b64, int wrap)
        struct sshbuf *b = NULL;
        size_t i, l;
 
+       if (sshbuf_len(d) == 0)
+               return 0;
+
        if ((b = sshbuf_new()) == NULL)
                return SSH_ERR_ALLOC_FAIL;
        /* Encode using regular base64; we'll transform it once done */