don't try to cleanup NULL KEX proposals in kex_prop_free();

found by Jukka Taimisto and Markus Hietava

diff --git a/usr.bin/ssh/kex.c b/usr.bin/ssh/kex.c
index d5d7e5c..b328e5f 100644 (file)
--- a/usr.bin/ssh/kex.c
+++ b/usr.bin/ssh/kex.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kex.c,v 1.105 2015/01/30 00:22:25 djm Exp $ */
+/* $OpenBSD: kex.c,v 1.106 2015/04/17 13:25:52 djm Exp $ */
 /*
  * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
  *
@@ -210,6 +210,8 @@ kex_prop_free(char **proposal)
 {
        u_int i;
 
+       if (proposal == NULL)
+               return;
        for (i = 0; i < PROPOSAL_MAX; i++)
                free(proposal[i]);
        free(proposal);