sctp: fix a SCTP_MIB_CURRESTAB leak in sctp_sf_do_dupcook_b

[ Upstream commit f282df0391267fb2b263da1cc3233aa6fb81defc ]

Normally SCTP_MIB_CURRESTAB is always incremented once asoc enter into
ESTABLISHED from the state < ESTABLISHED and decremented when the asoc
is being deleted.

However, in sctp_sf_do_dupcook_b(), the asoc's state can be changed to
ESTABLISHED from the state >= ESTABLISHED where it shouldn't increment
SCTP_MIB_CURRESTAB. Otherwise, one asoc may increment MIB_CURRESTAB
multiple times but only decrement once at the end.

I was able to reproduce it by using scapy to do the 4-way shakehands,
after that I replayed the COOKIE-ECHO chunk with 'peer_vtag' field
changed to different values, and SCTP_MIB_CURRESTAB was incremented
multiple times and never went back to 0 even when the asoc was freed.

This patch is to fix it by only incrementing SCTP_MIB_CURRESTAB when
the state < ESTABLISHED in sctp_sf_do_dupcook_b().

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 80b9f7f097fa86df6d7fbbb96c0f27fb133143aa..e943fb28f581bef1a9362817421d50572fa5ac19 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -1888,7 +1888,8 @@ static enum sctp_disposition sctp_sf_do_dupcook_b(
        sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc));
        sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
                        SCTP_STATE(SCTP_STATE_ESTABLISHED));
-       SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB);
+       if (asoc->state < SCTP_STATE_ESTABLISHED)
+               SCTP_INC_STATS(net, SCTP_MIB_CURRESTAB);
        sctp_add_cmd_sf(commands, SCTP_CMD_HB_TIMERS_START, SCTP_NULL());
 
        repl = sctp_make_cookie_ack(new_asoc, chunk);