netdev - Re: [PATCH net] sfc: fix null pointer dereference in efx_hard_start

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Message-ID: <19857eee-cb09-761a-948a-08753b105d1c@gmail.com>
Date:   Wed, 14 Sep 2022 18:50:04 +0100
From:   Edward Cree <ecree.xilinx@...il.com>
To:     Íñigo Huguet <ihuguet@...hat.com>,
        habetsm.xilinx@...il.com
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        Tianhao Zhao <tizhao@...hat.com>
Subject: Re: [PATCH net] sfc: fix null pointer dereference in
 efx_hard_start_xmit

On 14/09/2022 12:11, Íñigo Huguet wrote:
> Trying to get the channel from the tx_queue variable here is wrong
> because we can only be here if tx_queue is NULL, so we shouldn't
> dereference it. As the above comment in the code says, this is very
> unlikely to happen, but it's wrong anyway so let's fix it.
> 
> I hit this issue because of a different bug that caused tx_queue to be
> NULL. If that happens, this is the error message that we get here:
>   BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
>   [...]
>   RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]
> 
> Fixes: 12804793b17c ("sfc: decouple TXQ type from label")
> Reported-by: Tianhao Zhao <tizhao@...hat.com>
> Signed-off-by: Íñigo Huguet <ihuguet@...hat.com>

Acked-by: Edward Cree <ecree.xilinx@...il.com>