Description: drm/vmwgfx: check that number of mip levels is above zero
References:
 https://lists.freedesktop.org/archives/dri-devel/2017-March/136814.html
 https://bugzilla.redhat.com/show_bug.cgi?id=1435719
 https://marc.info/?t=149037004200005&r=1&w=2
 https://cgit.freedesktop.org/mesa/vmwgfx/commit/?id=e904061d2c8968429954be87ad1cc45526510812
Notes:
 bwh> This seems to have been discovered independently by Murray
 bwh> McAllister, Vladis Dronov and Li Qiang, resulting in three
 bwh> slightly different fixes.  Murray McAllister's version was
 bwh> applied upstream.
Bugs:
upstream: released (4.11-rc6) [36274ab8c596f1240c606bb514da329add2a1bcd]
4.9-upstream-stable: released (4.9.22) [73ab72517b61ce4b27ceddec47dd5d6edafb556a]
3.16-upstream-stable: released (3.16.44) [61cabe967321767052498032178d56a1ea03a7bc]
3.2-upstream-stable: released (3.2.89) [20996e6d81c907b10a5ab57c4172be97cb1a7de1]
sid: released (4.9.18-1) [bugfix/x86/vmwgfx-null-pointer-dereference-in-vmw_surface_define_ioctl.patch]
3.16-jessie-security: released (3.16.43-1) [bugfix/x86/vmwgfx-null-pointer-dereference-in-vmw_surface_define_ioctl.patch]
3.2-wheezy-security: released (3.2.88-1) [bugfix/x86/vmwgfx-null-pointer-dereference-in-vmw_surface_define_ioctl.patch]