[openssh-commits] [openssh] branch V_10_3 updated: upstream: fix hard-to-reach NULL deref during pubkey auth

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djm pushed a commit to branch V_10_3
in repository openssh.

The following commit(s) were added to refs/heads/V_10_3 by this push:
     new f945f1256 upstream: fix hard-to-reach NULL deref during pubkey auth
f945f1256 is described below

commit f945f1256d094039fa7ba97092e2f8e67ef090ad
Author: djm at openbsd.org <djm at openbsd.org>
AuthorDate: Wed May 13 05:11:02 2026 +0000

    upstream: fix hard-to-reach NULL deref during pubkey auth
    
    To hit this, the user must be using a PEM style private key with no
    corresponding .pub key adjacent to it.
    
    OpenBSD-Commit-ID: b7150acc5322fa33f21491834d9471fbe3d30f20
---
 sshconnect2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sshconnect2.c b/sshconnect2.c
index 478a9a52f..5a48c73ed 100644
--- a/sshconnect2.c
+++ b/sshconnect2.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshconnect2.c,v 1.385 2026/04/02 07:48:13 djm Exp $ */
+/* $OpenBSD: sshconnect2.c,v 1.386 2026/05/13 05:11:02 djm Exp $ */
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
  * Copyright (c) 2008 Damien Miller.  All rights reserved.
@@ -1277,7 +1277,7 @@ identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
 	 * PKCS#11 tokens may not support all signature algorithms,
 	 * so check what we get back.
 	 */
-	if ((id->key->flags & SSHKEY_FLAG_EXT) != 0 &&
+	if (id->key != NULL && (id->key->flags & SSHKEY_FLAG_EXT) != 0 &&
 	    (r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0) {
 		debug_fr(r, "sshkey_check_sigtype");
 		goto out;

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