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[144.76.156.219]) by smtp.gmail.com with ESMTPSA id n9-20020a5d5989000000b002bc7fcf08ddsm11645394wri.103.2023.02.07.05.04.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Feb 2023 05:04:43 -0800 (PST) From: Matthieu Baerts Date: Tue, 07 Feb 2023 14:04:14 +0100 Subject: [PATCH net 2/6] mptcp: fix locking for setsockopt corner-case MIME-Version: 1.0 Message-Id: <20230207-upstream-net-20230207-various-fix-6-2-v1-2-2031b495c7cc@tessares.net> References: <20230207-upstream-net-20230207-various-fix-6-2-v1-0-2031b495c7cc@tessares.net> In-Reply-To: <20230207-upstream-net-20230207-various-fix-6-2-v1-0-2031b495c7cc@tessares.net> To: mptcp@lists.linux.dev, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Davide Caratti , Mat Martineau , Benjamin Hesmans , Geliang Tang , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Matthieu Baerts , stable@vger.kernel.org X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=1507; i=matthieu.baerts@tessares.net; h=from:subject:message-id; bh=tU92Z5FtU+rxP2x5Q9J2r5aQ+mvHt8iWMbRSULE+GL8=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBj4kxo3Fz3M6U+ZqFEqliFhKp6GfvWCWFMRgKtp KfknMVgtAiJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCY+JMaAAKCRD2t4JPQmmg c7XfD/43VLBXwdb+RbXPVii16WQ7mY2RSpjNlzgqZ3sBZup/f8WZGkVzNABwdXWm9QMzPNHwEnU kBeYf+UtjhvF+f3lkdU0PZ756cNxJQkbS7VxrzFt5dpy9doA/i8xTeV7TNLnA5NaVR6BGSbXit6 UZzXqoPZRWErMWFN3jcTkiKsbGX2Z+CUSRdo0jh8YLXpZtLt3Slxi5x4Xr3xNv6cFKpUCzDGEAX vPi8JFtfMzVzfQx3R1PK2kGGXE7qmzVJZVrQNwRba7s32pGuYOn4w1quZ9oALgBbNWw1YtxH+5y ZK8JwgaGyxrVOyrREUKORoLrTVkzc8oDze9MGSxQ+Fynn2k+uy9PcEK5blZwGWIRP/ChPU8XZ2P jANo1DCq5XrEqkTP2Qo3b3kwmoFggzZO5H6M9VBCWgjpl+OOF/zYTVZ+bi3RiD1yUWSlKDV4F27 mtE3FPGWfLBedr2gZnIBxjWDZBvaTQL51YgyuPKYMKW8y8lxu+LDG1ExexmXgoqLefI/63OeMdz kRa9NAD2ineJZd5cChSQRpvDIlTcHKyDVUMciS14uuZwA76y37D5NgG8F37JBHZx+HUrymsYqDj NCXByJtLbR0eu8vqlsd7DOGznFk5E8C8sRiVAcGnqjuObFdNHmv7kekqWhcoHGW30OFm78J9Scz CJvs9L9o6bHugmA== X-Developer-Key: i=matthieu.baerts@tessares.net; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1757177602199154181?= X-GMAIL-MSGID: =?utf-8?q?1757177602199154181?= From: Paolo Abeni We need to call the __mptcp_nmpc_socket(), and later subflow socket access under the msk socket lock, or e.g. a racing connect() could change the socket status under the hood, with unexpected results. Fixes: 54635bd04701 ("mptcp: add TCP_FASTOPEN_CONNECT socket option") Cc: stable@vger.kernel.org Signed-off-by: Paolo Abeni Reviewed-by: Matthieu Baerts Signed-off-by: Matthieu Baerts --- net/mptcp/sockopt.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/net/mptcp/sockopt.c b/net/mptcp/sockopt.c index d4b1e6ec1b36..7f2c3727ab23 100644 --- a/net/mptcp/sockopt.c +++ b/net/mptcp/sockopt.c @@ -760,14 +760,21 @@ static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, static int mptcp_setsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, sockptr_t optval, unsigned int optlen) { + struct sock *sk = (struct sock *)msk; struct socket *sock; + int ret = -EINVAL; /* Limit to first subflow, before the connection establishment */ + lock_sock(sk); sock = __mptcp_nmpc_socket(msk); if (!sock) - return -EINVAL; + goto unlock; - return tcp_setsockopt(sock->sk, level, optname, optval, optlen); + ret = tcp_setsockopt(sock->sk, level, optname, optval, optlen); + +unlock: + release_sock(sk); + return ret; } static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,