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

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Date:   Tue, 20 Dec 2022 11:36:10 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     wei.fang@....com
Cc:     davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        xiaoning.wang@....com, shenwei.wang@....com,
        alexander.duyck@...il.com, 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.