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

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Message-ID: <90ff72e75142e377273ef980ca2d26951449610c.camel@redhat.com>
Date:   Tue, 20 Dec 2022 15:46:56 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     wei.fang@....com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, xiaoning.wang@....com, shenwei.wang@....com,
        linux-imx@....com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: fec: Coverity issue: Dereference null return
 value

Hello,

On Thu, 2022-12-15 at 17:11 +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.
> 
> Signed-off-by: Wei Fang <wei.fang@....com>
> Reviewed-by: Shenwei Wang <Shenwei.wang@....com>

You need to include a suitable fixes tag here. Please repost adding it
and retaining  Alex's reviwed-by tag, thanks!

Paolo