linux-kernel - Re: [PATCH 4.19] net/sched: cls_fw: Fix improper refcount update leads to use-after-free

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Message-ID: <2023080159-status-barracuda-99dd@gregkh>
Date:   Tue, 1 Aug 2023 10:21:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     SeongJae Park <sj@...nel.org>
Cc:     stable@...r.kernel.org, M A Ramdhan <ramdhan@...rlabs.sg>,
        sashal@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, hailmo@...zon.com,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Pedro Tammela <pctammela@...atatu.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 4.19] net/sched: cls_fw: Fix improper refcount update
 leads to use-after-free

On Thu, Jul 27, 2023 at 05:46:28PM +0000, SeongJae Park wrote:
> From: M A Ramdhan <ramdhan@...rlabs.sg>
> 
> [ Upstream commit 0323bce598eea038714f941ce2b22541c46d488f ]
> 
> In the event of a failure in tcf_change_indev(), fw_set_parms() will
> immediately return an error after incrementing or decrementing
> reference counter in tcf_bind_filter().  If attacker can control
> reference counter to zero and make reference freed, leading to
> use after free.
> 
> In order to prevent this, move the point of possible failure above the
> point where the TC_FW_CLASSID is handled.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Reported-by: M A Ramdhan <ramdhan@...rlabs.sg>
> Signed-off-by: M A Ramdhan <ramdhan@...rlabs.sg>
> Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
> Reviewed-by: Pedro Tammela <pctammela@...atatu.com>
> Message-ID: <20230705161530.52003-1-ramdhan@...rlabs.sg>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: SeongJae Park <sj@...nel.org>
> ---
>  net/sched/cls_fw.c | 10 +++++-----

Both now queued up, thanks.

greg k-h