From 2259f3d335ca40c4a9550057ea91fafc67bdbc07 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Fri, 25 May 2018 14:06:51 +0100
Subject: [PATCH] Fix null deref on writing OpenSSH pubkey with no comment.

If we're called on to generate the one-line OpenSSH public key format
for a key that we don't have a comment field for, we were mistakenly
testing this by checking if '*comment' rather than 'comment' was zero,
i.e. if comment was NULL we'd dereference it by mistake.
---
 sshpubk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sshpubk.c b/sshpubk.c
index c60b9dfc..1198a009 100644
--- a/sshpubk.c
+++ b/sshpubk.c
@@ -1502,7 +1502,7 @@ static char *ssh2_pubkey_openssh_str_internal(const char *comment,
         i += n;
         p += 4;
     }
-    if (*comment) {
+    if (comment) {
         *p++ = ' ';
         strcpy(p, comment);
     } else