linux-kernel - Re: [PATCH] team: Fix use-after-free when an option instance allocation fails

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Message-ID: <CABRcYmKK0F1F5SzXoUpG4etDz2eGhJoSZo56PHq7M+MNjcjTKA@mail.gmail.com>
Date:   Wed, 6 Dec 2023 17:31:58 +0100
From:   Florent Revest <revest@...omium.org>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        jiri@...nulli.us, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, stable@...r.kernel.org
Subject: Re: [PATCH] team: Fix use-after-free when an option instance
 allocation fails

On Wed, Dec 6, 2023 at 4:05 PM Hangbin Liu <liuhangbin@...il.com> wrote:
>
> On Wed, Dec 06, 2023 at 01:37:18PM +0100, Florent Revest wrote:
> > In __team_options_register, team_options are allocated and appended to
> > the team's option_list.
> > If one option instance allocation fails, the "inst_rollback" cleanup
> > path frees the previously allocated options but doesn't remove them from
> > the team's option_list.
> > This leaves dangling pointers that can be dereferenced later by other
> > parts of the team driver that iterate over options.
> >
> > This patch fixes the cleanup path to remove the dangling pointers from
> > the list.
> >
> > As far as I can tell, this uaf doesn't have much security implications
> > since it would be fairly hard to exploit (an attacker would need to make
> > the allocation of that specific small object fail) but it's still nice
> > to fix.
> >
> > Fixes: 80f7c6683fe0 ("team: add support for per-port options")
> > Signed-off-by: Florent Revest <revest@...omium.org>
>
> Reviewed-by: Hangbin Liu <liuhangbin@...il.com>

Thank you for the quick reviews Hangbin & Jiri, I appreciate! :)

I just realized I forgot to CC stable (like I always do... :) maybe I
should tattoo it on my arm) Let me know if you'd like a v2 adding:

Cc: stable@...r.kernel.org