guix-devel/gnu/packages/patches/lcms-fix-out-of-bounds-read.patch

Fix an out-of-bounds heap read in Type_MLU_Read():

http://seclists.org/oss-sec/2016/q3/288
https://bugzilla.redhat.com/show_bug.cgi?id=1367357

Patch copied from upstream source repository:

https://github.com/mm2/Little-CMS/commit/5ca71a7bc18b6897ab21d815d15e218e204581e2

From 5ca71a7bc18b6897ab21d815d15e218e204581e2 Mon Sep 17 00:00:00 2001
From: Marti <marti.maria@tktbrainpower.com>
Date: Mon, 15 Aug 2016 23:31:39 +0200
Subject: [PATCH] Added an extra check to MLU bounds

Thanks to Ibrahim el-sayed for spotting the bug
---
 src/cmstypes.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/cmstypes.c b/src/cmstypes.c
index cb61860..c7328b9 100644
--- a/src/cmstypes.c
+++ b/src/cmstypes.c
@@ -1460,6 +1460,7 @@ void *Type_MLU_Read(struct _cms_typehandler_struct* self, cmsIOHANDLER* io, cmsU
 
         // Check for overflow
         if (Offset < (SizeOfHeader + 8)) goto Error;
+        if ((Offset + Len) > SizeOfTag + 8) goto Error;
 
         // True begin of the string
         BeginOfThisString = Offset - SizeOfHeader - 8;
-- 
2.11.0