linux-kernel - [PATCH 4.16 15/55] net/smc: restrict non-blocking connect finish

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Message-Id: <20180518081458.215956909@linuxfoundation.org>
Date:   Fri, 18 May 2018 10:15:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ursula Braun <ubraun@...ux.ibm.com>,
        syzbot+03faa2dc16b8b64be396@...kaller.appspotmail.com,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.16 15/55] net/smc: restrict non-blocking connect finish

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ursula Braun <ubraun@...ux.ibm.com>

[ Upstream commit 784813aed6ba24a1f24e7e11d9d0f208cee37a7d ]

The smc_poll code tries to finish connect() if the socket is in
state SMC_INIT and polling of the internal CLC-socket returns with
EPOLLOUT. This makes sense for a select/poll call following a connect
call, but not without preceding connect().
With this patch smc_poll starts connect logic only, if the CLC-socket
is no longer in its initial state TCP_CLOSE.

In addition, a poll error on the internal CLC-socket is always
propagated to the SMC socket.

With this patch the code path mentioned by syzbot
https://syzkaller.appspot.com/bug?extid=03faa2dc16b8b64be396
is no longer possible.

Signed-off-by: Ursula Braun <ubraun@...ux.ibm.com>
Reported-by: syzbot+03faa2dc16b8b64be396@...kaller.appspotmail.com
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/smc/af_smc.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1165,13 +1165,15 @@ static __poll_t smc_poll(struct file *fi
 		/* delegate to CLC child sock */
 		release_sock(sk);
 		mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
-		/* if non-blocking connect finished ... */
 		lock_sock(sk);
-		if ((sk->sk_state == SMC_INIT) && (mask & EPOLLOUT)) {
-			sk->sk_err = smc->clcsock->sk->sk_err;
-			if (sk->sk_err) {
-				mask |= EPOLLERR;
-			} else {
+		sk->sk_err = smc->clcsock->sk->sk_err;
+		if (sk->sk_err) {
+			mask |= EPOLLERR;
+		} else {
+			/* if non-blocking connect finished ... */
+			if (sk->sk_state == SMC_INIT &&
+			    mask & EPOLLOUT &&
+			    smc->clcsock->sk->sk_state != TCP_CLOSE) {
 				rc = smc_connect_rdma(smc);
 				if (rc < 0)
 					mask |= EPOLLERR;