linux-kernel - [Linux-kernel-mentees] [PATCH] v4l2-tpg: Clamp hue in tpg_s

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Date:   Fri, 21 Aug 2020 11:13:43 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH] v4l2-tpg: Clamp hue in tpg_s_hue()

Setting `hue` by calling tpg_s_hue() directly is risky, since it does not
perform range check. Clamp `hue` to the valid range in tpg_s_hue().

Suggested-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
 include/media/tpg/v4l2-tpg.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/media/tpg/v4l2-tpg.h b/include/media/tpg/v4l2-tpg.h
index eb191e85d363..fd15e5db9f5b 100644
--- a/include/media/tpg/v4l2-tpg.h
+++ b/include/media/tpg/v4l2-tpg.h
@@ -324,6 +324,7 @@ static inline void tpg_s_saturation(struct tpg_data *tpg,
 static inline void tpg_s_hue(struct tpg_data *tpg,
 					s16 hue)
 {
+	hue = clamp_t(s16, hue, -128, 128);
 	if (tpg->hue == hue)
 		return;
 	tpg->hue = hue;
-- 
2.25.1