Patch "media: v4l2-dv-timings: add sanity checks for blanking values" has been added to the 4.9-stable tree

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This is a note to let you know that I've just added the patch titled

    media: v4l2-dv-timings: add sanity checks for blanking values

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-v4l2-dv-timings-add-sanity-checks-for-blanking.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 531ac9100e6bcdf1f2e894a7b5df85bb11faf895
Author: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Date:   Thu Oct 13 09:00:34 2022 +0100

    media: v4l2-dv-timings: add sanity checks for blanking values
    
    [ Upstream commit 4b6d66a45ed34a15721cb9e11492fa1a24bc83df ]
    
    Add sanity checks to v4l2_valid_dv_timings() to ensure that the provided
    blanking values are reasonable.
    
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Fixes: b18787ed1ce3 ([media] v4l2-dv-timings: add new helper module)
    Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c
index 730a7c392c1d..12e04ac6a9ee 100644
--- a/drivers/media/v4l2-core/v4l2-dv-timings.c
+++ b/drivers/media/v4l2-core/v4l2-dv-timings.c
@@ -171,6 +171,20 @@ bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
 	    (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
 	    (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
 		return false;
+
+	/* sanity checks for the blanking timings */
+	if (!bt->interlaced &&
+	    (bt->il_vbackporch || bt->il_vsync || bt->il_vfrontporch))
+		return false;
+	if (bt->hfrontporch > 2 * bt->width ||
+	    bt->hsync > 1024 || bt->hbackporch > 1024)
+		return false;
+	if (bt->vfrontporch > 4096 ||
+	    bt->vsync > 128 || bt->vbackporch > 4096)
+		return false;
+	if (bt->interlaced && (bt->il_vfrontporch > 4096 ||
+	    bt->il_vsync > 128 || bt->il_vbackporch > 4096))
+		return false;
 	return fnc == NULL || fnc(t, fnc_handle);
 }
 EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);



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