netdev - Re: [PATCH][next] mptcp: fix a dereference of pointer before msk is null checked.

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Date:   Wed, 11 Nov 2020 10:49:20 -0800 (PST)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>,
        Jakub Kicinski <kuba@...nel.org>
cc:     Matthieu Baerts <matthieu.baerts@...sares.net>,
        "David S . Miller" <davem@...emloft.net>,
        Geliang Tang <geliangtang@...il.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        mptcp@...ts.01.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mptcp: fix a dereference of pointer before msk is
 null checked.

On Mon, 9 Nov 2020, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>
>
> Currently the assignment of pointer net from the sock_net(sk) call
> is potentially dereferencing a null pointer sk. sk points to the
> same location as pointer msk and msk is being null checked after
> the sock_net call.  Fix this by calling sock_net after the null
> check on pointer msk.
>
> Addresses-Coverity: ("Dereference before null check")
> Fixes: 00cfd77b9063 ("mptcp: retransmit ADD_ADDR when timeout")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
> net/mptcp/pm_netlink.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>

Hi Colin and Jakub -

I noticed that the follow-up discussion on this patch didn't go to the 
netdev list, so patchwork did not get updated.

This patch is superseded by the following, which already has a Reviewed-by 
tag from Matthieu:

http://patchwork.ozlabs.org/project/netdev/patch/078a2ef5bdc4e3b2c25ef852461692001f426495.1604976945.git.geliangtang@gmail.com/


Thanks!

--
Mat Martineau
Intel