system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-22 20:37:18 +00:00
Code Issues Packages Projects Releases Wiki Activity

drm: plane: Check crtc coordinates against integer overflows in setplane ioctl

Browse source 
Help drivers a little by guaranteeing that crtc_x+crtc_w and
crtc_y+crtc_h don't overflow.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Ville Syrjälä 2011-12-20 00:06:45 +02:00 committed by Dave Airlie
parent 42ef87896a
commit 687a040038
1 changed files with 12 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/gpu/drm/drm_crtc.c
View file

@ -1732,6 +1732,18 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
goto out;
}
/* Give drivers some help against integer overflows */
if (plane_req->crtc_w > INT_MAX ||
plane_req->crtc_x > INT_MAX - (int32_t) plane_req->crtc_w ||
plane_req->crtc_h > INT_MAX ||
plane_req->crtc_y > INT_MAX - (int32_t) plane_req->crtc_h) {
DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
plane_req->crtc_w, plane_req->crtc_h,
plane_req->crtc_x, plane_req->crtc_y);
ret = -ERANGE;
goto out;
}
ret = plane->funcs->update_plane(plane, crtc, fb,
plane_req->crtc_x, plane_req->crtc_y,
plane_req->crtc_w, plane_req->crtc_h,