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net/smc: add fallback check to connect()

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commit 86434744fedf0cfe07a9eee3f4632c0e25c1d136 upstream.

FASTOPEN setsockopt() or sendmsg() may switch the SMC socket to fallback
mode. Once fallback mode is active, the native TCP socket functions are
called. Nevertheless there is a small race window, when FASTOPEN
setsockopt/sendmsg runs in parallel to a connect(), and switch the
socket into fallback mode before connect() takes the sock lock.
Make sure the SMC-specific connect setup is omitted in this case.

This way a syzbot-reported refcount problem is fixed, triggered by
different threads running non-blocking connect() and FASTOPEN_KEY
setsockopt.

Reported-by: syzbot+96d3f9ff6a86d37e44c8@syzkaller.appspotmail.com
Fixes: 6d6dd528d5 ("net/smc: fix refcount non-blocking connect() -part 2")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ursula Braun 2019-12-12 22:35:58 +01:00 committed by Greg Kroah-Hartman
parent e83c40f7bb
commit 90e0e78bfa
1 changed files with 8 additions and 6 deletions
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14
net/smc/af_smc.c
View File

@ -854,6 +854,8 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
goto out;
sock_hold(&smc->sk); /* sock put in passive closing */
if (smc->use_fallback)
goto out;
if (flags & O_NONBLOCK) {
if (schedule_work(&smc->connect_work))
smc->connect_nonblock = 1;
@ -1716,8 +1718,6 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
sk->sk_err = smc->clcsock->sk->sk_err;
sk->sk_error_report(sk);
}
if (rc)
return rc;
if (optlen < sizeof(int))
return -EINVAL;
@ -1725,6 +1725,8 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
return -EFAULT;
lock_sock(sk);
if (rc || smc->use_fallback)
goto out;
switch (optname) {
case TCP_ULP:
case TCP_FASTOPEN:
@ -1736,15 +1738,14 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
smc_switch_to_fallback(smc);
smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
} else {
if (!smc->use_fallback)
rc = -EINVAL;
rc = -EINVAL;
}
break;
case TCP_NODELAY:
if (sk->sk_state != SMC_INIT &&
sk->sk_state != SMC_LISTEN &&
sk->sk_state != SMC_CLOSED) {
if (val && !smc->use_fallback)
if (val)
mod_delayed_work(system_wq, &smc->conn.tx_work,
0);
}
@ -1753,7 +1754,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
if (sk->sk_state != SMC_INIT &&
sk->sk_state != SMC_LISTEN &&
sk->sk_state != SMC_CLOSED) {
if (!val && !smc->use_fallback)
if (!val)
mod_delayed_work(system_wq, &smc->conn.tx_work,
0);
}
@ -1764,6 +1765,7 @@ static int smc_setsockopt(struct socket *sock, int level, int optname,
default:
break;
}
out:
release_sock(sk);
return rc;