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

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[ 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@xs4all.nl>
Fixes: b18787ed1ce3 ([media] v4l2-dv-timings: add new helper module)
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans Verkuil 2022-10-13 09:00:34 +01:00 committed by Greg Kroah-Hartman
parent e1b5b06198
commit 15ded23db1
1 changed files with 14 additions and 0 deletions
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14
drivers/media/v4l2-core/v4l2-dv-timings.c
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@ -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);