From 3851cc386e1d98f5407fadc2932815f0f6831205 Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Sun, 27 Dec 2009 22:29:22 +0100
Subject: [PATCH] Prevent NULL dereferencing when unregistering ciphers

---
 lib/crypto.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/crypto.c b/lib/crypto.c
index 021560d6c..d11f0994f 100644
--- a/lib/crypto.c
+++ b/lib/crypto.c
@@ -59,7 +59,10 @@ grub_cipher_unregister (gcry_cipher_spec_t *cipher)
   gcry_cipher_spec_t **ciph;
   for (ciph = &grub_ciphers; *ciph; ciph = &((*ciph)->next))
     if (*ciph == cipher)
-      *ciph = (*ciph)->next;
+      {
+	*ciph = (*ciph)->next;
+	break;
+      }
 }
 
 void 
@@ -75,7 +78,10 @@ grub_md_unregister (gcry_md_spec_t *cipher)
   gcry_md_spec_t **ciph;
   for (ciph = &grub_digests; *ciph; ciph = &((*ciph)->next))
     if (*ciph == cipher)
-      *ciph = (*ciph)->next;
+      {
+	*ciph = (*ciph)->next;
+	break;
+      }
 }
 
 void