netdev - Re: "KMSAN: uninit-value in rt2500usb_bbp_read" and "KMSAN: uninit-value in rt2500usb_probe

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Message-ID: <20210121092510.GA648258@wp.pl>
Date:   Thu, 21 Jan 2021 10:25:10 +0100
From:   Stanislaw Gruszka <stf_xl@...pl>
To:     慕冬亮 <mudongliangabcd@...il.com>
Cc:     davem@...emloft.net, helmut.schaa@...glemail.com, kuba@...nel.org,
        kvalo@...eaurora.org, linux-kernel <linux-kernel@...r.kernel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Greg KH <greg@...ah.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: "KMSAN: uninit-value in rt2500usb_bbp_read" and "KMSAN:
 uninit-value in rt2500usb_probe_hw" should be duplicate crash reports

On Thu, Jan 21, 2021 at 04:47:37PM +0800, 慕冬亮 wrote:
> ## Patch
> 
> I propose to memset reg variable before invoking
> rt2x00usb_vendor_req_buff_lock/rt2x00usb_vendor_request_buff.
> 
> ------------------------------------------------------------------------------------------------------------------------
> diff --git a/drivers/net/wireless/ralink/rt2x00/rt2500usb.c
> b/drivers/net/wireless/ralink/rt2x00/rt2500usb.c
> index fce05fc88aaf..f6c93a25b18c 100644
> --- a/drivers/net/wireless/ralink/rt2x00/rt2500usb.c
> +++ b/drivers/net/wireless/ralink/rt2x00/rt2500usb.c
> @@ -48,6 +48,7 @@ static u16 rt2500usb_register_read(struct rt2x00_dev
> *rt2x00dev,
>                                    const unsigned int offset)
>  {
>         __le16 reg;
> +       memset(&reg, 0, sizeof(reg));

Simpler would be just to initialize like this: __le16 reg = 0; 

Stanislaw