netdev - Re: [PATCH net 3/3] mptcp: remove msk from the token container at destruction time.

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Date:   Fri, 29 May 2020 10:36:13 -0700 (PDT)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Paolo Abeni <pabeni@...hat.com>
cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net 3/3] mptcp: remove msk from the token container at
 destruction time.

On Fri, 29 May 2020, Paolo Abeni wrote:

> Currently we remote the msk from the token container only
> via mptcp_close(). The MPTCP master socket can be destroyed
> also via other paths (e.g. if not yet accepted, when shutting
> down the listener socket). When we hit the latter scenario,
> dangling msk references are left into the token container,
> leading to memory corruption and/or UaF.
>
> This change addresses the issue by moving the token removal
> into the msk destructor.
>
> Fixes: 79c0949e9a09 ("mptcp: Add key generation and token tree")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
> net/mptcp/protocol.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>

--
Mat Martineau
Intel