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

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Date:   Thu, 24 Nov 2022 09:53:55 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     YueHaibing <yuehaibing@...wei.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

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.

Thanks,

Paolo