linux-kernel - [PATCH 3.2 125/140] [media] media: v4l2-compat-ioctl32: fix missing reserved field copy in put_v4l2

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Date:   Wed, 28 Feb 2018 15:20:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Tiffany Lin" <tiffany.lin@...iatek.com>,
        "Hans Verkuil" <hans.verkuil@...co.com>,
        "Mauro Carvalho Chehab" <mchehab@....samsung.com>
Subject: [PATCH 3.2 125/140] [media] media: v4l2-compat-ioctl32: fix
 missing reserved field copy in put_v4l2_create32

3.2.100-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tiffany Lin <tiffany.lin@...iatek.com>

commit baf43c6eace43868e490f18560287fa3481b2159 upstream.

In v4l2-compliance utility, test VIDIOC_CREATE_BUFS will check whether reserved
filed of v4l2_create_buffers filled with zero
Reserved field is filled with zero in v4l_create_bufs.
This patch copy reserved field of v4l2_create_buffer from kernel space to user
space

Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/video/v4l2-compat-ioctl32.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/media/video/v4l2-compat-ioctl32.c
+++ b/drivers/media/video/v4l2-compat-ioctl32.c
@@ -267,7 +267,8 @@ static int put_v4l2_format32(struct v4l2
 static int put_v4l2_create32(struct v4l2_create_buffers *kp, struct v4l2_create_buffers32 __user *up)
 {
 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_create_buffers32)) ||
-	    copy_to_user(up, kp, offsetof(struct v4l2_create_buffers32, format)))
+	    copy_to_user(up, kp, offsetof(struct v4l2_create_buffers32, format)) ||
+	    copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
 		return -EFAULT;
 	return __put_v4l2_format32(&kp->format, &up->format);
 }