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

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Message-ID: <ZXB1VHnrE98H4p9Q@nanopsycho>
Date:   Wed, 6 Dec 2023 14:21:24 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Florent Revest <revest@...omium.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Subject: Re: [PATCH] team: Fix use-after-free when an option instance
 allocation fails

Wed, Dec 06, 2023 at 01:37:18PM CET, revest@...omium.org 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: Jiri Pirko <jiri@...dia.com>

Thanks!