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[21/41] drm/i915: Clamp cursor coordinates to int16_t range

Message ID 1407203723-24877-22-git-send-email-dheerajx.s.jamwal@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dheeraj Jamwal Aug. 5, 2014, 1:55 a.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

We store cursor_x/y as int16_t internally, but the user provided
coordinates are int32_t. Clamp the coordinates so that they don't
overflow the int16_t. Since the cursor is only 64x64 in size, the
clamping can't cause any visual changes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit 92e76c8c7e436a07af3e0b594480ff8689add078)

Signed-off-by: Dheeraj Jamwal <dheerajx.s.jamwal@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ba39d12..0af10bf 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7333,8 +7333,8 @@  static int intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
-	intel_crtc->cursor_x = x;
-	intel_crtc->cursor_y = y;
+	intel_crtc->cursor_x = clamp_t(int, x, SHRT_MIN, SHRT_MAX);
+	intel_crtc->cursor_y = clamp_t(int, y, SHRT_MIN, SHRT_MAX);
 
 	if (intel_crtc->active)
 		intel_crtc_update_cursor(crtc, intel_crtc->cursor_bo != NULL);