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net/smc: no shutdown in state SMC_LISTEN

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commit caa21e19e08d7a1445116a93f7ab4e187ebbbadb upstream.

Invoking shutdown for a socket in state SMC_LISTEN does not make
sense. Nevertheless programs like syzbot fuzzing the kernel may
try to do this. For SMC this means a socket refcounting problem.
This patch makes sure a shutdown call for an SMC socket in state
SMC_LISTEN simply returns with -ENOTCONN.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ursula Braun 2018-08-08 14:13:19 +02:00 committed by Greg Kroah-Hartman
parent 9e9f27e0d7
commit 3f59cf41fb
1 changed files with 1 additions and 2 deletions
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3
net/smc/af_smc.c
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@ -1180,8 +1180,7 @@ static int smc_shutdown(struct socket *sock, int how)
lock_sock(sk);
rc = -ENOTCONN;
if ((sk->sk_state != SMC_LISTEN) &&
(sk->sk_state != SMC_ACTIVE) &&
if ((sk->sk_state != SMC_ACTIVE) &&
(sk->sk_state != SMC_PEERCLOSEWAIT1) &&
(sk->sk_state != SMC_PEERCLOSEWAIT2) &&
(sk->sk_state != SMC_APPCLOSEWAIT1) &&