linux-kernel - Re: [PATCH] media: v4l2-compat-ioctl32.c: copy reserved2 field in get_v4l2

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Date:   Fri, 17 Apr 2020 09:24:02 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     sy0816.kang@...sung.com
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: v4l2-compat-ioctl32.c: copy reserved2 field in
 get_v4l2_buffer32

Em Fri, 17 Apr 2020 11:45:23 +0900
sy0816.kang@...sung.com escreveu:

> From: Sunyoung Kang <sy0816.kang@...sung.com>
> 
> get_v4l2_buffer32() didn't copy reserved2 field from userspace to driver.
> So the reserved2 value is not received through compat-ioctl32 in driver.
> This patch copy reserved2 field of v4l2_buffer in get_v4l2_buffer32().

Why should it copy reserved values? Those should not be used anywhere.

> 
> Signed-off-by: Sunyoung Kang <sy0816.kang@...sung.com>
> ---
>  drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> index a99e82ec9ab6..e9b2b9c0ec9a 100644
> --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
> @@ -665,6 +665,7 @@ static int get_v4l2_buffer32(struct v4l2_buffer __user *p64,
>  	if (V4L2_TYPE_IS_OUTPUT(type))
>  		if (assign_in_user(&p64->bytesused, &p32->bytesused) ||
>  		    assign_in_user(&p64->field, &p32->field) ||
> +		    assign_in_user(&p64->reserved2, &p32->reserved2) ||
>  		    assign_in_user(&p64->timestamp.tv_sec,
>  				   &p32->timestamp.tv_sec) ||
>  		    assign_in_user(&p64->timestamp.tv_usec,



Thanks,
Mauro