From patchwork Thu Jun 10 09:28:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianguo Wu X-Patchwork-Id: 12312441 X-Patchwork-Delegate: pabeni@redhat.com Received: from m12-11.163.com (m12-11.163.com [220.181.12.11]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4FBEA72 for ; Thu, 10 Jun 2021 09:28:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Message-ID:Date:MIME-Version; bh=YFxUK P5fEEmYWeV0Hcy6CGbOw+jLSo/aT6C2UWA5cMA=; b=gf4og5x5byRqgKevs2P78 dXedaCSAiGQMlzF2EZy0i5No0nlHf9OXyq/tBCjXFr/D8O/43B/ShwdBDDrw49Ag GSIfyxiQR1pxsCPXA9P1xxcWW+sAGemFAWxS2EABU+lxWwdFjGItfOH1txjg14vR /RtrSguhTTDyKXmicJPna8= Received: from [192.168.16.78] (unknown [110.86.5.93]) by smtp7 (Coremail) with SMTP id C8CowAAXA4tL28FgBPH1hA--.23962S2; Thu, 10 Jun 2021 17:28:43 +0800 (CST) To: mptcp@lists.linux.dev Cc: Paolo Abeni From: Jianguo Wu Subject: [PATCH v2 2/4] mptcp: remove redundant req destruct in subflow_check_req() Message-ID: Date: Thu, 10 Jun 2021 17:28:43 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: C8CowAAXA4tL28FgBPH1hA--.23962S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Cr4Dtw47WFWrtryktF4ktFb_yoW8Gryfpr sxXw1YyrZxZFyakF4rJF4DZrn0gayFvFn8GFyY93sxJr4qqws3KF1UWr48uFy3Aa1kKay7 GFsxtFnxX3ZF9aUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07j_db8UUUUU= X-Originating-IP: [110.86.5.93] X-CM-SenderInfo: 5zxmxt5qjx0iiqw6il2tof0z/1tbiUQGtkFWBTQ8RgAABsr From: Jianguo Wu 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 --- net/mptcp/subflow.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 6b1cd42..75ed530 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -213,11 +213,6 @@ 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; }