Commit 7311d665 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller

net/smc: move sock lock in smc_ioctl()

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: 1992d998 ("net/smc: take sock lock in smc_ioctl()")
Signed-off-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bd58c7e0
......@@ -1522,12 +1522,16 @@ static int smc_ioctl(struct socket *sock, unsigned int cmd,
smc = smc_sk(sock->sk);
conn = &smc->conn;
lock_sock(&smc->sk);
if (smc->use_fallback) {
if (!smc->clcsock)
if (!smc->clcsock) {
release_sock(&smc->sk);
return -EBADF;
return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
}
lock_sock(&smc->sk);
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) {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment