diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2011-12-20 02:06:45 +0400 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2011-12-20 14:04:46 +0400 |
| commit | 687a040038fb92c764adbb349ca132226677b417 (patch) | |
| tree | 6f3617f2a55a482313bd12999980e52e9c3dbed4 /drivers/gpu/drm/drm_crtc.c | |
| parent | 42ef87896adeb3116835a1e88abab84dafc1912d (diff) | |
| download | linux-687a040038fb92c764adbb349ca132226677b417.tar.xz | |
drm: plane: Check crtc coordinates against integer overflows in setplane ioctl
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>
Diffstat (limited to 'drivers/gpu/drm/drm_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 1242e121e4ad..b98e49112081 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -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, |