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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>
This commit is contained in:
Zhao Junwang 2015-07-07 17:08:35 +08:00 committed by Daniel Vetter
parent 41315b793e
commit 01447e9f04
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/drm_crtc.c
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@ -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);