File CVE-2012-1573.patch of Package gnutls.openSUSE_12.1_Update

Index: gnutls-3.0.3/lib/gnutls_cipher.c
===================================================================
--- gnutls-3.0.3.orig/lib/gnutls_cipher.c
+++ gnutls-3.0.3/lib/gnutls_cipher.c
@@ -502,7 +502,7 @@ ciphertext_to_compressed (gnutls_session
 
       break;
     case CIPHER_BLOCK:
-      if (ciphertext->size < MAX(blocksize, tag_size) || (ciphertext->size % blocksize != 0))
+      if (ciphertext->size < blocksize || (ciphertext->size % blocksize != 0))
         return gnutls_assert_val(GNUTLS_E_UNEXPECTED_PACKET_LENGTH);
 
       /* ignore the IV in TLS 1.1+
@@ -514,14 +514,11 @@ ciphertext_to_compressed (gnutls_session
 
           ciphertext->size -= blocksize;
           ciphertext->data += blocksize;
-
-          if (ciphertext->size == 0)
-            {
-              gnutls_assert ();
-              return GNUTLS_E_DECRYPTION_FAILED;
-            }
         }
 
+      if (ciphertext->size < tag_size)
+	      return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
+
       /* we don't use the auth_cipher interface here, since
        * TLS with block ciphers is impossible to be used under such
        * an API. (the length of plaintext is required to calculate