From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1EF704431 for ; Wed, 15 Mar 2023 12:28:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 976D4C433EF; Wed, 15 Mar 2023 12:28:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678883297; bh=KGxRvdYEHzfuFENxpfQiUlpiEV1ThXMfLkFokVmPB9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WGKoyAbyPD+IJpEZBslK/loJSsXHLFjmAnQQPpH50blQyM6jX0PCTe25dVnt6q3gX 0eJdQXbKs33+n2fSyLrw2g5I/Q83Rq57BzGPSe3wJSbxcavgcezIB0qn55wvt876QJ 2Fce3R3LG23RnlLr5xZGDkPkFOStzJmIhvURvXZ4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "D. Wythe" , Simon Horman , Tony Lu , "David S. Miller" , Sasha Levin Subject: [PATCH 5.15 073/145] net/smc: fix fallback failed while sendmsg with fastopen Date: Wed, 15 Mar 2023 13:12:19 +0100 Message-Id: <20230315115741.420587533@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230315115738.951067403@linuxfoundation.org> References: <20230315115738.951067403@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: D. Wythe [ Upstream commit ce7ca794712f186da99719e8b4e97bd5ddbb04c3 ] Before determining whether the msg has unsupported options, it has been prematurely terminated by the wrong status check. For the application, the general usages of MSG_FASTOPEN likes fd = socket(...) /* rather than connect */ sendto(fd, data, len, MSG_FASTOPEN) Hence, We need to check the flag before state check, because the sock state here is always SMC_INIT when applications tries MSG_FASTOPEN. Once we found unsupported options, fallback it to TCP. Fixes: ee9dfbef02d1 ("net/smc: handle sockopts forcing fallback") Signed-off-by: D. Wythe Signed-off-by: Simon Horman v2 -> v1: Optimize code style Reviewed-by: Tony Lu Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/smc/af_smc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index d5ddf283ed8e2..9cdb7df0801f3 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -2172,16 +2172,14 @@ static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; struct smc_sock *smc; - int rc = -EPIPE; + int rc; smc = smc_sk(sk); lock_sock(sk); - if ((sk->sk_state != SMC_ACTIVE) && - (sk->sk_state != SMC_APPCLOSEWAIT1) && - (sk->sk_state != SMC_INIT)) - goto out; + /* SMC does not support connect with fastopen */ if (msg->msg_flags & MSG_FASTOPEN) { + /* not connected yet, fallback */ if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) { rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP); if (rc) @@ -2190,6 +2188,11 @@ static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) rc = -EINVAL; goto out; } + } else if ((sk->sk_state != SMC_ACTIVE) && + (sk->sk_state != SMC_APPCLOSEWAIT1) && + (sk->sk_state != SMC_INIT)) { + rc = -EPIPE; + goto out; } if (smc->use_fallback) { -- 2.39.2