linux-kernel - Re: [PATCH] [media] pvrusb2: qctrl.flag will be uninitlaized if cx2341x_ctrl

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Message-ID: <alpine.DEB.2.20.1908251247040.22242@lochley.isely.net>
Date:   Sun, 25 Aug 2019 12:47:20 -0500 (CDT)
From:   isely@...ly.net
To:     Yizhuo <yzhai003@....edu>
cc:     csong@...ucr.edu, zhiyunq@...ucr.edu,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mike Isely at pobox <isely@...ox.com>
Subject: Re: [PATCH] [media] pvrusb2: qctrl.flag will be uninitlaized if
 cx2341x_ctrl_query() returns error code


Acked-by: Mike Isely <isely@...ox.com>

On Wed, 21 Aug 2019, Yizhuo wrote:

> Inside function ctrl_cx2341x_getv4lflags(), qctrl.flag
> will be uninitlaized if cx2341x_ctrl_query() returns -EINVAL.
> However, it will be used in the later if statement, which is
> potentially unsafe.
> 
> Signed-off-by: Yizhuo <yzhai003@....edu>
> ---
>  drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> index ad5b25b89699..1fa05971316a 100644
> --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> @@ -793,6 +793,7 @@ static unsigned int ctrl_cx2341x_getv4lflags(struct pvr2_ctrl *cptr)
>  	struct v4l2_queryctrl qctrl;
>  	struct pvr2_ctl_info *info;
>  	qctrl.id = cptr->info->v4l_id;
> +	memset(&qctr, 0, sizeof(qctrl))
>  	cx2341x_ctrl_query(&cptr->hdw->enc_ctl_state,&qctrl);
>  	/* Strip out the const so we can adjust a function pointer.  It's
>  	   OK to do this here because we know this is a dynamically created
> 

-- 

Mike Isely
isely @ isely (dot) net
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