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net/smc: move sock lock in smc_ioctl()

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When an SMC socket is connecting it is decided whether fallback to
TCP is needed. To avoid races between connect and ioctl move the
sock lock before the use_fallback check.

Reported-by: syzbot+5b2cece1a8ecb2ca77d8@syzkaller.appspotmail.com
Reported-by: syzbot+19557374321ca3710990@syzkaller.appspotmail.com
Fixes: 1992d99882 ("net/smc: take sock lock in smc_ioctl()")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2018-08-08 14:13:21 +02:00 committed by David S. Miller
parent bd58c7e086
commit 7311d665ca
1 changed files with 9 additions and 5 deletions
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14
net/smc/af_smc.c
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@ -1522,12 +1522,16 @@ static int smc_ioctl(struct socket *sock, unsigned int cmd,
smc = smc_sk(sock->sk);
conn = &smc->conn;
if (smc->use_fallback) {
if (!smc->clcsock)
return -EBADF;
return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
}
lock_sock(&smc->sk);
if (smc->use_fallback) {
if (!smc->clcsock) {
release_sock(&smc->sk);
return -EBADF;
}
answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
release_sock(&smc->sk);
return answ;
}
switch (cmd) {
case SIOCINQ: /* same as FIONREAD */
if (smc->sk.sk_state == SMC_LISTEN) {