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Subject[PATCH for 6.1 3/4] v4l2-dv-timings: add sanity checks for blanking values
Date
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)
---
drivers/media/v4l2-core/v4l2-dv-timings.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c
index af48705c704f..003c32fed3f7 100644
--- a/drivers/media/v4l2-core/v4l2-dv-timings.c
+++ b/drivers/media/v4l2-core/v4l2-dv-timings.c
@@ -161,6 +161,20 @@ 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);
--
2.35.1
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