linux-kernel - [PATCH] media: v4l2-ioctl: clear fields in s

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Date:   Wed, 29 May 2019 12:32:47 +0100
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     stable@...r.kernel.org
Cc:     linux-media@...r.kernel.org, hverkuil-cisco@...all.nl,
        linux-kernel@...r.kernel.org,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: [PATCH] media: v4l2-ioctl: clear fields in s_parm

From: Hans Verkuil <hans.verkuil@...co.com>

commit 8a7c5594c02022ca5fa7fb603e11b3e1feb76ed5 upstream.

Zero the reserved capture/output array.

Zero the extendedmode (it is never used in drivers).

Clear all flags in capture/outputmode except for V4L2_MODE_HIGHQUALITY,
as that is the only valid flag.

Cc: <stable@...r.kernel.org> # v4.9 v4.14
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 4510e8a37244..699e5f8e0a71 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1959,7 +1959,22 @@ static int v4l_s_parm(const struct v4l2_ioctl_ops *ops,
 	struct v4l2_streamparm *p = arg;
 	int ret = check_fmt(file, p->type);
 
-	return ret ? ret : ops->vidioc_s_parm(file, fh, p);
+	if (ret)
+		return ret;
+
+	/* Note: extendedmode is never used in drivers */
+	if (V4L2_TYPE_IS_OUTPUT(p->type)) {
+		memset(p->parm.output.reserved, 0,
+		       sizeof(p->parm.output.reserved));
+		p->parm.output.extendedmode = 0;
+		p->parm.output.outputmode &= V4L2_MODE_HIGHQUALITY;
+	} else {
+		memset(p->parm.capture.reserved, 0,
+		       sizeof(p->parm.capture.reserved));
+		p->parm.capture.extendedmode = 0;
+		p->parm.capture.capturemode &= V4L2_MODE_HIGHQUALITY;
+	}
+	return ops->vidioc_s_parm(file, fh, p);
 }
 
 static int v4l_queryctrl(const struct v4l2_ioctl_ops *ops,
-- 
2.17.1