linux-kernel - Re: [PATCH net] ax25: use after free in ax25

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Message-ID: <8fc4701f-c151-0545-c047-a5df90575d69@gmail.com>
Date:   Fri, 14 Jan 2022 07:19:56 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Hangyu Hua <hbh25y@...il.com>, jreuter@...na.de,
        ralf@...ux-mips.org, davem@...emloft.net, kuba@...nel.org
Cc:     linux-hams@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] ax25: use after free in ax25_connect


On 1/13/22 22:54, Hangyu Hua wrote:
> Any suggestions for this patch ? Guys.
>
> I think putting sk_to_ax25 after lock_sock(sk) here will avoid any 
> possilbe race conditions like other functions in ax25_proto_ops. CTING) {
>

As explained, your patch is not needed.

You failed to describe how a race was possible.

Just moving code around wont help.

How about providing a stack trace or some syzbot repro ?