- markus@cvs.openbsd.org 2006/10/31 16:33:12

     [kexdhc.c kexdhs.c kexgexc.c kexgexs.c]
     check DH_compute_key() for -1 even if it should not happen because of
     earlier calls to dh_pub_is_valid(); report krahmer at suse.de; ok djm

1 files changed, 5 insertions, 3 deletions

diff --git a/kexgexc.c b/kexgexc.c
index 2c19713e1..49d50116a 100644
--- a/kexgexc.c
+++ b/kexgexc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: kexgexc.c,v 1.9 2006/08/03 03:34:42 deraadt Exp $ */
+/* $OpenBSD: kexgexc.c,v 1.10 2006/10/31 16:33:12 markus Exp $ */
 /*
  * Copyright (c) 2000 Niels Provos.  All rights reserved.
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
@@ -51,7 +51,8 @@ kexgex_client(Kex *kex)
         BIGNUM *p = NULL, *g = NULL;
         Key *server_host_key;
         u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL;
-        u_int klen, kout, slen, sbloblen, hashlen;
+        u_int klen, slen, sbloblen, hashlen;
+        int kout;
         int min, max, nbits;
         DH *dh;
 
@@ -150,7 +151,8 @@ kexgex_client(Kex *kex)
 
         klen = DH_size(dh);
         kbuf = xmalloc(klen);
-        kout = DH_compute_key(kbuf, dh_server_pub, dh);
+        if ((kout = DH_compute_key(kbuf, dh_server_pub, dh)) < 0)
+                fatal("DH_compute_key: failed");
 #ifdef DEBUG_KEXDH
         dump_digest("shared secret", kbuf, kout);
 #endif