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tcp: fix bug in listening_get_next()

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commit a8b690f98b (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@yahoo.com>
CC: Tom Herbert <therbert@google.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-01-24 14:41:20 -08:00 committed by David S. Miller
parent 3408404a4c
commit fd0273c503
1 changed files with 0 additions and 1 deletions
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1
net/ipv4/tcp_ipv4.c
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@ -1994,7 +1994,6 @@ static void *listening_get_next(struct seq_file *seq, void *cur)
}
req = req->dl_next;
}
st->offset = 0;
if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries)
break;
get_req: