linux-kernel - RE: [PATCH V2 net] net: fec: Coverity issue: Dereference null return value

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Message-ID: <DB9PR04MB81065D13CA5FA737EDA4E55B88EB9@DB9PR04MB8106.eurprd04.prod.outlook.com>
Date:   Wed, 21 Dec 2022 01:39:55 +0000
From:   Wei Fang <wei.fang@....com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        Clark Wang <xiaoning.wang@....com>,
        Shenwei Wang <shenwei.wang@....com>,
        "alexander.duyck@...il.com" <alexander.duyck@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V2 net] net: fec: Coverity issue: Dereference null return
 value


> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: 2022年12月21日 3:36
> To: Wei Fang <wei.fang@....com>
> Cc: davem@...emloft.net; edumazet@...gle.com; pabeni@...hat.com;
> Clark Wang <xiaoning.wang@....com>; Shenwei Wang
> <shenwei.wang@....com>; alexander.duyck@...il.com; dl-linux-imx
> <linux-imx@....com>; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH V2 net] net: fec: Coverity issue: Dereference null return
> value
> 
> On Mon, 19 Dec 2022 10:27:55 +0800 wei.fang@....com wrote:
> > From: Wei Fang <wei.fang@....com>
> >
> > The build_skb might return a null pointer but there is no check on the
> > return value in the fec_enet_rx_queue(). So a null pointer dereference
> > might occur. To avoid this, we check the return value of build_skb. If
> > the return value is a null pointer, the driver will recycle the page
> > and update the statistic of ndev. Then jump to rx_processing_done to
> > clear the status flags of the BD so that the hardware can recycle the BD.
> 
> Applied but I had to change the subject because the subject should describe
> the change. Mentioning the tool which found the problem belongs in the body
> of the message.

Thanks for taking the time to make these changes, I'll keep these things in mind
next time.