linux-kernel - Re: [PATCH v2 2/2] staging: rtl8712: fix uninit-value in r871xu_drv

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Date:   Fri, 6 May 2022 19:56:57 +0800
From:   Wang Cheng <wanngchenng@...il.com>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     dan.carpenter@...cle.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] staging: rtl8712: fix uninit-value in
 r871xu_drv_init()

On 22/05/06 07:33PM, Wang Cheng wrote:
> On 22/05/06 10:41AM, Pavel Skripkin wrote:
> > Hi Wang,
> > 
> > On 5/6/22 06:16, Wang Cheng wrote:
> > 
> > [snip]
> > 
> > > 
> > > Reported-and-tested-by: syzbot+6f5ecd144854c0d8580b@...kaller.appspotmail.com
> > > Signed-off-by: Wang Cheng <wanngchenng@...il.com>
> > > ---
> > >   drivers/staging/rtl8712/usb_intf.c | 6 +++---
> > >   1 file changed, 3 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
> > > index ee4c61f85a07..50dcd3ecb685 100644
> > > --- a/drivers/staging/rtl8712/usb_intf.c
> > > +++ b/drivers/staging/rtl8712/usb_intf.c
> > > @@ -538,13 +538,13 @@ static int r871xu_drv_init(struct usb_interface *pusb_intf,
> > >   		} else {
> > >   			AutoloadFail = false;
> > >   		}
> > > -		if (((mac[0] == 0xff) && (mac[1] == 0xff) &&
> > > +		if ((!AutoloadFail) ||
> > > +		    ((mac[0] == 0xff) && (mac[1] == 0xff) &&
> > >   		     (mac[2] == 0xff) && (mac[3] == 0xff) &&
> > >   		     (mac[4] == 0xff) && (mac[5] == 0xff)) ||
> > >   		    ((mac[0] == 0x00) && (mac[1] == 0x00) &&
> > >   		     (mac[2] == 0x00) && (mac[3] == 0x00) &&
> > > -		     (mac[4] == 0x00) && (mac[5] == 0x00)) ||
> > > -		     (!AutoloadFail)) {
> > > +		     (mac[4] == 0x00) && (mac[5] == 0x00))) {
> > 
> > 
> > That looks ugly. I mean mac checks. Can we, please, use sane kernel API like
> > is_valid_ether_addr()?
> 
> Good idea! But will is_valid_ether_addr() check a larger range?
> The comment of is_valid_ether_addr()(include/linux/etherdevice.h) says:
>   Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
>   a *multicast address*, and is not FF:FF:FF:FF:FF:FF.

is_zero_ether_addr() in etherdevice.h could check the all zero mac address.

thanks,
- w

> 
> 
> > 
> > 
> > >   			mac[0] = 0x00;
> > >   			mac[1] = 0xe0;
> > >   			mac[2] = 0x4c;
> > 
> > 
> > 
> > 
> > With regards,
> > Pavel Skripkin