From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 31 Oct 2013 18:00:10 +0000 (+0300)
Subject: xfs: underflow bug in xfs_attrlist_by_handle()
X-Git-Tag: v3.2.54~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc5285f4c67a48e5775d633267f8e284626a990a;p=pandora-kernel.git

xfs: underflow bug in xfs_attrlist_by_handle()

commit 31978b5cc66b8ba8a7e8eef60b12395d41b7b890 upstream.

If we allocate less than sizeof(struct attrlist) then we end up
corrupting memory or doing a ZERO_PTR_SIZE dereference.

This can only be triggered with CAP_SYS_ADMIN.

Reported-by: Nico Golde <nico@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

(cherry picked from commit 071c529eb672648ee8ca3f90944bcbcc730b4c06)
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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