linux-kernel - Re: Problems with /proc/net/tcp6 - possible bug

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Message-Id: <20110124.144200.112610203.davem@davemloft.net>
Date:	Mon, 24 Jan 2011 14:42:00 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	runningdoglackey@...oo.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, therbert@...gle.com
Subject: Re: Problems with /proc/net/tcp6 - possible bug - ipv6

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 22 Jan 2011 16:15:44 +0100

> [PATCH] tcp: fix bug in listening_get_next()
> 
> commit a8b690f98baf9fb19 (tcp: Fix slowness in read /proc/net/tcp)
> introduced a bug in handling of SYN_RECV sockets.
> 
> st->offset represents number of sockets found since beginning of
> listening_hash[st->bucket].
> 
> We should not reset st->offset when iterating through
> syn_table[st->sbucket], or else if more than ~25 sockets (if
> PAGE_SIZE=4096) are in SYN_RECV state, we exit from listening_get_next()
> with a too small st->offset
> 
> Next time we enter tcp_seek_last_pos(), we are not able to seek past
> already found sockets.
> 
> Reported-by: PK <runningdoglackey@...oo.com>
> CC: Tom Herbert <therbert@...gle.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied and queued up for -stable, thanks Eric.
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