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From: Mat Martineau <mathew.j.martineau@linux.intel.com>
To: netdev@vger.kernel.org
Cc: Jianguo Wu <wujianguo@chinatelecom.cn>,
	davem@davemloft.net, kuba@kernel.org,
	matthieu.baerts@tessares.net, geliangtang@gmail.com,
	mptcp@lists.linux.dev,
	Mat Martineau <mathew.j.martineau@linux.intel.com>
Subject: [PATCH net 2/6] mptcp: remove redundant req destruct in subflow_check_req()
Date: Fri,  9 Jul 2021 17:20:47 -0700	[thread overview]
Message-ID: <20210710002051.216010-3-mathew.j.martineau@linux.intel.com> (raw)
In-Reply-To: <20210710002051.216010-1-mathew.j.martineau@linux.intel.com>

From: Jianguo Wu <wujianguo@chinatelecom.cn>

In subflow_check_req(), if subflow sport is mismatch, will put msk,
destroy token, and destruct req, then return -EPERM, which can be
done by subflow_req_destructor() via:

  tcp_conn_request()
    |--__reqsk_free()
      |--subflow_req_destructor()

So we should remove these redundant code, otherwise will call
tcp_v4_reqsk_destructor() twice, and may double free
inet_rsk(req)->ireq_opt.

Fixes: 5bc56388c74f ("mptcp: add port number check for MP_JOIN")
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
---
 net/mptcp/subflow.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 66d0b1893d26..b15e2017168d 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -214,11 +214,6 @@ static int subflow_check_req(struct request_sock *req,
 				 ntohs(inet_sk(sk_listener)->inet_sport),
 				 ntohs(inet_sk((struct sock *)subflow_req->msk)->inet_sport));
 			if (!mptcp_pm_sport_in_anno_list(subflow_req->msk, sk_listener)) {
-				sock_put((struct sock *)subflow_req->msk);
-				mptcp_token_destroy_request(req);
-				tcp_request_sock_ops.destructor(req);
-				subflow_req->msk = NULL;
-				subflow_req->mp_join = 0;
 				SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_MISMATCHPORTSYNRX);
 				return -EPERM;
 			}
-- 
2.32.0


  parent reply	other threads:[~2021-07-10  0:21 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-10  0:20 [PATCH net 0/6] mptcp: Connection and accounting fixes Mat Martineau
2021-07-10  0:20 ` [PATCH net 1/6] mptcp: fix warning in __skb_flow_dissect() when do syn cookie for subflow join Mat Martineau
2021-07-10  0:20 ` Mat Martineau [this message]
2021-07-10  0:20 ` [PATCH net 3/6] mptcp: fix syncookie process if mptcp can not_accept new subflow Mat Martineau
2021-07-10  0:20 ` [PATCH net 4/6] mptcp: avoid processing packet if a subflow reset Mat Martineau
2021-07-10  0:20 ` [PATCH net 5/6] selftests: mptcp: fix case multiple subflows limited by server Mat Martineau
2021-07-10  0:20 ` [PATCH net 6/6] mptcp: properly account bulk freed memory Mat Martineau
2021-07-10  1:50 ` [PATCH net 0/6] mptcp: Connection and accounting fixes patchwork-bot+netdevbpf

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