netdev - Re: (ipt_log_packet, sb_add) 3.6.0-rc2 kernel panic - not syncing; Fatal exception in interrupt

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Date:	Mon, 10 Sep 2012 07:02:04 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Florian Westphal <fw@...len.de>,
	Sami Farin <hvtaifwkbgefbaei@...il.com>,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: Re: (ipt_log_packet, sb_add) 3.6.0-rc2 kernel panic - not syncing;
 Fatal exception in interrupt


On Monday 2012-09-03 00:53, Eric Dumazet wrote:
>[PATCH] xt_LOG: take care of timewait sockets
>
>Sami Farin reported crashes in xt_LOG because it assumes skb->sk is a
>full blown socket.
>
>But with TCP early demux, we can have skb->sk pointing to a timewait
>socket.
>
>+static void dump_sk_uid_gid(struct sbuff *m, struct sock *sk)
>+{
>+	if (!sk || sk->sk_state == TCP_TIME_WAIT)
>+		return;
>+
>+	read_lock_bh(&sk->sk_callback_lock);
>+	if (sk->sk_socket && sk->sk_socket->file)
>+		sb_add(m, "UID=%u GID=%u ",
>+			sk->sk_socket->file->f_cred->fsuid,
>+			sk->sk_socket->file->f_cred->fsgid);

xt_owner.c is also using f_cred, so it might need the same,
does it not?

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