debian/patches/CVE-2014-8xxx/0006-dri2-integer-overflow-in-ProcDRI2GetBuffers-CVE-2014.patch

   1 From f07eb544bbcfd9d4c64f036b654f4567f1fd2b9c Mon Sep 17 00:00:00 2001
   2 From: Alan Coopersmith <alan.coopersmith@oracle.com>
   3 Date: Wed, 22 Jan 2014 23:40:18 -0800
   4 Subject: [PATCH 06/33] dri2: integer overflow in ProcDRI2GetBuffers()
   5  [CVE-2014-8094]
   6
   7 ProcDRI2GetBuffers() tries to validate a length field (count).
   8 There is an integer overflow in the validation. This can cause
   9 out of bound reads and memory corruption later on.
  10
  11 Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
  12 Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
  13 Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
  14 Reviewed-by: Julien Cristau <jcristau@debian.org>
  15 ---
  16  hw/xfree86/dri2/dri2ext.c |    3 +++
  17  1 file changed, 3 insertions(+)
  18
  19 --- a/hw/xfree86/dri2/dri2ext.c
  20 +++ b/hw/xfree86/dri2/dri2ext.c
  21 @@ -278,6 +278,9 @@ ProcDRI2GetBuffers(ClientPtr client)
  22      unsigned int *attachments;
  23
  24      REQUEST_FIXED_SIZE(xDRI2GetBuffersReq, stuff->count * 4);
  25 +    if (stuff->count > (INT_MAX / 4))
  26 +        return BadLength;
  27 +
  28      if (!validDrawable(client, stuff->drawable, DixReadAccess | DixWriteAccess,
  29                         &pDrawable, &status))
  30          return status;