linux-kernel - Re: Re: [PATCH] net: ieee802154: fix a null pointer in nl802154_trigger

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Message-ID: <2b209456.234a2.186bb608224.Coremail.dzm91@hust.edu.cn>
Date:   Tue, 7 Mar 2023 17:21:49 +0800 (GMT+08:00)
From:   慕冬亮 <dzm91@...t.edu.cn>
To:     "miquel raynal" <miquel.raynal@...tlin.com>
Cc:     "denis kirjanov" <dkirjanov@...e.de>,
        "alexander aring" <alex.aring@...il.com>,
        "stefan schmidt" <stefan@...enfreihafen.org>,
        "david s. miller" <davem@...emloft.net>,
        "eric dumazet" <edumazet@...gle.com>,
        "jakub kicinski" <kuba@...nel.org>,
        "paolo abeni" <pabeni@...hat.com>,
        syzbot+bd85b31816913a32e473@...kaller.appspotmail.com,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH] net: ieee802154: fix a null pointer in
 nl802154_trigger_scan




> -----原始邮件-----
> 发件人: "Miquel Raynal" <miquel.raynal@...tlin.com>
> 发送时间: 2023-03-07 17:09:03 (星期二)
> 收件人: "Denis Kirjanov" <dkirjanov@...e.de>
> 抄送: "Dongliang Mu" <dzm91@...t.edu.cn>, "Alexander Aring" <alex.aring@...il.com>, "Stefan Schmidt" <stefan@...enfreihafen.org>, "David
>  S. Miller" <davem@...emloft.net>, "Eric Dumazet" <edumazet@...gle.com>, "Jakub
>  Kicinski" <kuba@...nel.org>, "Paolo Abeni" <pabeni@...hat.com>, syzbot+bd85b31816913a32e473@...kaller.appspotmail.com, linux-wpan@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
> 主题: Re: [PATCH] net: ieee802154: fix a null pointer in nl802154_trigger_scan
> 
> Hello,
> 
> dkirjanov@...e.de wrote on Tue, 7 Mar 2023 11:43:46 +0300:
> 
> > On 3/7/23 10:30, Dongliang Mu wrote:
> > > There is a null pointer dereference if NL802154_ATTR_SCAN_TYPE is
> > > not set by the user.
> > > 
> > > Fix this by adding a null pointer check.
> 
> Thanks for the patch! This has been fixed already:
> https://lore.kernel.org/linux-wpan/20230301154450.547716-1-miquel.raynal@bootlin.com/T/#u

Oh, I see. Thanks for your reply.

A small issue: should we still check !nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])?

> 
> > > Reported-and-tested-by: syzbot+bd85b31816913a32e473@...kaller.appspotmail.com
> 
> Just for reference, this tag shall not be used:
> 
> 	"Please do not use combined tags, e.g.
> 	``Reported-and-tested-by``"
> 	Documentation/process/maintainer-tip.rst
> 

Okay. This is suggested by Syzbot. I will use separate tags in the future.

> > > Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>  
> > 
> > Please add a Fixes: tag 
> > 
> > > ---
> > >  net/ieee802154/nl802154.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
> > > index 2215f576ee37..1cf00cffd63f 100644
> > > --- a/net/ieee802154/nl802154.c
> > > +++ b/net/ieee802154/nl802154.c
> > > @@ -1412,7 +1412,8 @@ static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
> > >  		return -EOPNOTSUPP;
> > >  	}
> > >  
> > > -	if (!nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])) {
> > > +	if (!info->attrs[NL802154_ATTR_SCAN_TYPE] ||
> > > +	    !nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])) {
> > >  		NL_SET_ERR_MSG(info->extack, "Malformed request, missing scan type");
> > >  		return -EINVAL;
> > >  	}  
> 
> 
> Thanks,
> Miquèl


--
Best regards,
Dongliang Mu