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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Mauro Carvalho Chehab <mchehab@s-opensource.com>
Subject: [PATCH 3.18 74/93] media: v4l2-compat-ioctl32: initialize a reserved field
Date:   Fri,  6 Apr 2018 15:23:43 +0200
Message-Id: <20180406084228.313537673@linuxfoundation.org>
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3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The get_v4l2_create32() function is missing a logic with
would be cleaning a reserved field, causing v4l2-compliance
to complain:

 Buffer ioctls (Input 0):
		fail: v4l2-test-buffers.cpp(506): check_0(crbufs.reserved, sizeof(crbufs.reserved))
	test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: FAIL

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -247,7 +247,8 @@ static int get_v4l2_create32(struct v4l2
 {
 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 	    copy_in_user(kp, up,
-			 offsetof(struct v4l2_create_buffers32, format)))
+			 offsetof(struct v4l2_create_buffers32, format)) ||
+	    copy_in_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
 		return -EFAULT;
 	return __get_v4l2_format32(&kp->format, &up->format,
 				   aux_buf, aux_space);