drm/vmwgfx: limit the number of mip levels in vmw_gb_surface_define_ioctl()

CVE-2017-7346

The 'req->mip_levels' parameter in vmw_gb_surface_define_ioctl() is
a user-controlled 'uint32_t' value which is used as a loop count limit.
This can lead to a kernel lockup and DoS. Add check for 'req->mip_levels'.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1437431

Cc: <stable@vger.kernel.org>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
(cherry picked from commit ee9c4e681ec4f58e42a83cb0c22a0289ade1aacf)
Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 05fa092c942beedb209b25777971a0c196d19d85..6fed5a8da00516d47a1d2dee8899575fcdc21f6a 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -1280,6 +1280,9 @@ int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
        if (req->multisample_count != 0)
                return -EINVAL;
 
+       if (req->mip_levels > DRM_VMW_MAX_MIP_LEVELS)
+               return -EINVAL;
+
        if (unlikely(vmw_user_surface_size == 0))
                vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
                        128;