From: Paulo Alcantara <pc@manguebit.org>
To: Wentao Liang <vulab@iscas.ac.cn>, bharathsm@microsoft.com
Cc: linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org,
ronniesahlberg@gmail.com, samba-technical@lists.samba.org,
sfrench@samba.org, sprasad@microsoft.com, tom@talpey.com,
Wentao Liang <vulab@iscas.ac.cn>,
stable@vger.kernel.org
Subject: Re: [PATCH] cifs: Fix server use-after-free in cifs_chan_skip_or_disable()
Date: Thu, 17 Sep 2026 19:48:55 -0300 [thread overview]
Message-ID: <9a0ffb5299163f5865eb8a805bddf4d6@manguebit.org> (raw)
In-Reply-To: <20260917163439.2162539-1-vulab@iscas.ac.cn>
Wentao Liang <vulab@iscas.ac.cn> writes:
> When a secondary channel is no longer supported by the server,
> cifs_chan_skip_or_disable() drops the channel reference with
> cifs_put_tcp_session() and then continues to use the server pointer by
> calling cifs_signal_cifsd_for_reconnect() on it and reading its
> primary_server pointer. cifs_put_tcp_session() can drop the last
> reference of the channel and tear it down, so both the channel and the
> primary server (whose reference is also dropped by
> cifs_put_tcp_session()) can be freed before they are signaled for
> reconnect.
>
> Signal the channel and the primary server and capture the primary
> server pointer before dropping the channel reference with
> cifs_put_tcp_session().
> ...
Applied.
prev parent reply other threads:[~2026-09-17 22:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-17 16:34 Wentao Liang
2026-09-17 22:48 ` Paulo Alcantara [this message]
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