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

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Message-ID: <alpine.DEB.2.20.1908261856340.22242@lochley.isely.net>
Date:   Mon, 26 Aug 2019 18:56:47 -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 <isely@...ly.net>
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 Mon, 26 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 | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> index ad5b25b89699..66a34fb9e6b2 100644
> --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
> @@ -790,7 +790,7 @@ static int ctrl_cx2341x_set(struct pvr2_ctrl *cptr,int m,int v)
>  
>  static unsigned int ctrl_cx2341x_getv4lflags(struct pvr2_ctrl *cptr)
>  {
> -	struct v4l2_queryctrl qctrl;
> +	struct v4l2_queryctrl qctrl = {};
>  	struct pvr2_ctl_info *info;
>  	qctrl.id = cptr->info->v4l_id;
>  	cx2341x_ctrl_query(&cptr->hdw->enc_ctl_state,&qctrl);
> 

-- 

Mike Isely
isely @ isely (dot) net
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