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dri2: integer overflow in ProcDRI2GetBuffers() [CVE-2014-8094]

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ProcDRI2GetBuffers() tries to validate a length field (count).
There is an integer overflow in the validation. This can cause
out of bound reads and memory corruption later on.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Julien Cristau <jcristau@debian.org>
(cherry picked from commit 6692670fde)
Signed-off-by: Julien Cristau <jcristau@debian.org>
This commit is contained in:
Alan Coopersmith 2014-01-22 23:40:18 -08:00 • committed by Julien Cristau
parent 2883994f9f
commit db386cd6a1
1 changed files with 3 additions and 0 deletions
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3
hw/xfree86/dri2/dri2ext.c
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@ -270,6 +270,9 @@ ProcDRI2GetBuffers(ClientPtr client)
unsigned int *attachments;
REQUEST_FIXED_SIZE(xDRI2GetBuffersReq, stuff->count * 4);
if (stuff->count > (INT_MAX / 4))
return BadLength;
if (!validDrawable(client, stuff->drawable, DixReadAccess | DixWriteAccess,
&pDrawable, &status))
return status;