From: Paolo Abeni <pab...@redhat.com>
Date: Wed, 10 Jun 2020 10:49:00 +0200
> If a listening MPTCP socket has unaccepted sockets at close
> time, the related msks are freed via mptcp_sock_destruct(),
> which in turn does not invoke the proto->destroy() method
> nor the mptcp_token_destroy() function.
>
> Due to the above, the child msk socket is not removed from
> the token container, leading to later UaF.
>
> Address the issue explicitly removing the token even in the
> above error path.
>
> Fixes: 79c0949e9a09 ("mptcp: Add key generation and token tree")
> Signed-off-by: Paolo Abeni <pab...@redhat.com>
Also applied and queued up for v5.6 -stable, thanks.
