[CVE-2017-7294][Yakkety] drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()

[Po-Hsu Lin]

From: Li Qiang <liq3ea at gmail.com>

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.

Cc: <stable at vger.kernel.org>
Signed-off-by: Li Qiang <liqiang6-s at 360.cn>
Reviewed-by: Thomas Hellstrom <thellstrom at vmware.com>
(cherry picked from commit e7e11f99564222d82f0ce84bd521e57d78a6678)
CVE-2017-7294
Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index c2a721a..aa0108d 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -715,8 +715,11 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 			128;
 
 	num_sizes = 0;
-	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
+	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) {
+		if (req->mip_levels[i] > DRM_VMW_MAX_MIP_LEVELS)
+			return -EINVAL;
 		num_sizes += req->mip_levels[i];
+	}
 
 	if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
 	    DRM_VMW_MAX_MIP_LEVELS)
-- 
1.7.9.5