diff options
| author | Zhao Junwang <zhjwpku@gmail.com> | 2015-07-07 17:08:35 +0800 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-07-07 14:05:12 +0200 |
| commit | 01447e9f04ba1c49a9534ae6a5a6f26c2bb05226 (patch) | |
| tree | 73c261984d099bfe5eb37d4236a32d3938e46e10 | |
| parent | 41315b793e13f884cda79389f0d5d44d027e57d1 (diff) | |
drm: add a check for x/y in drm_mode_setcrtc
legacy setcrtc ioctl does take a 32 bit value which might indeed
overflow
the checks of crtc_req->x > INT_MAX and crtc_req->y > INT_MAX aren't
needed any more with this
v2: -polish the annotation according to Daniel's comment
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Zhao Junwang <zhjwpku@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index b9ba06176eb1..357bd04a173b 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -2706,8 +2706,11 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data, if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EINVAL; - /* For some reason crtc x/y offsets are signed internally. */ - if (crtc_req->x > INT_MAX || crtc_req->y > INT_MAX) + /* + * Universal plane src offsets are only 16.16, prevent havoc for + * drivers using universal plane code internally. + */ + if (crtc_req->x & 0xffff0000 || crtc_req->y & 0xffff0000) return -ERANGE; drm_modeset_lock_all(dev); |