From: Li Qiang <liq3ea@gmail.com>
Date: Tue, 28 Mar 2017 03:10:53 +0000 (-0700)
Subject: drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
X-Git-Tag: v3.2.89~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c2e7959f2ea446a417bf2cdb79792575852d17bb;p=pandora-kernel.git

drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()

commit e7e11f99564222d82f0ce84bd521e57d78a6b678 upstream.

In vmw_surface_define_ioctl(), the 'num_sizes' is the sum of the
'req->mip_levels' array. This array can be assigned any value from
the user space. As both the 'num_sizes' and the array is uint32_t,
it is easy to make 'num_sizes' overflow. The later 'mip_levels' is
used as the loop count. This can lead an oob write. Add the check of
'req->mip_levels' to avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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