linux-kernel - Re: [PATCH net] net: hsr: Fix potential use-after-free

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Message-ID: <250b2e18-13bd-b0d5-8117-112ffc42b55a@huawei.com>
Date:   Fri, 25 Nov 2022 15:53:13 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Paolo Abeni <pabeni@...hat.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <arvid.brodin@...en.se>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: hsr: Fix potential use-after-free

On 2022/11/24 16:53, Paolo Abeni wrote:
> Hello,
> 
> On Wed, 2022-11-23 at 14:30 +0800, YueHaibing wrote:
>> The skb is delivered to netif_rx() which may free it, after calling this,
>> dereferencing skb may trigger use-after-free.
>>
>> Fixes: f266a683a480 ("net/hsr: Better frame dispatch")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> 
> The code looks good, but the above is not the commit introducing the
> issue, it just move the netif_rx() and later skb access from somewhere
> else.
> 
> Please go deeper in git history and find the change that originated the> issue.

Ok, will dig it.

> 
> Thanks,
> 
> Paolo
> 
> .
>