File libtasn1-CVE-2016-4008-2.patch of Package libtasn1

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File libtasn1-CVE-2016-4008-2.patch of Package libtasn1 (Revision 1b79020a95bcee1524e4767ae5dad454)

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From a6e0a0b58f5cdaf4e9beca5bce69c09808cbb625 Mon Sep 17 00:00:00 2001
From: Nikos Mavrogiannopoulos <nmav@redhat.com>
Date: Wed, 6 Apr 2016 13:02:19 +0200
Subject: [PATCH 1/1] _asn1_extract_der_octet: properly account the bytes read
 through indefinite encodings

This prevents infinite recursions in the function loop.
Reported by Pascal Cuoq.
---
 lib/decoding.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

Index: libtasn1-3.7/lib/decoding.c
===================================================================
--- libtasn1-3.7.orig/lib/decoding.c
+++ libtasn1-3.7/lib/decoding.c
@@ -665,7 +665,7 @@ _asn1_delete_not_used (asn1_node node)
 
 static int
 _asn1_extract_der_octet (asn1_node node, const unsigned char *der,
-			 int der_len)
+			 int der_len, int *bytes)
 {
   int len2, len3;
   int counter, counter_end;
@@ -708,15 +708,19 @@ _asn1_extract_der_octet (asn1_node node,
 	  DECR_LEN(der_len, len3);
 	  result =
 	    _asn1_extract_der_octet (node, der + counter + len3,
-				     der_len);
+				     der_len, &len2);
 	  if (result != ASN1_SUCCESS)
 	    return result;
-	  len2 = 0;
+
+	  DECR_LEN(der_len, len2);
 	}
 
       counter += len2 + len3 + 1;
     }
 
+  if (bytes)
+    *bytes = counter;
+
   return ASN1_SUCCESS;
 
 cleanup:
@@ -785,7 +789,7 @@ _asn1_get_octet_string (asn1_node node,
 	  asn1_length_der (tot_len, temp, &len2);
 	  _asn1_set_value (node, temp, len2);
 
-	  ret = _asn1_extract_der_octet (node, der, der_len);
+	  ret = _asn1_extract_der_octet (node, der, der_len, NULL);
 	  if (ret != ASN1_SUCCESS)
 	    return ret;

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File libtasn1-CVE-2016-4008-2.patch of Package libtasn1 (Revision 1b79020a95bcee1524e4767ae5dad454)

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