From: Ursula Braun Date: Wed, 8 Aug 2018 12:13:19 +0000 (+0200) Subject: net/smc: no shutdown in state SMC_LISTEN X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=caa21e19e08d7a1445116a93f7ab4e187ebbbadb;p=linux.git net/smc: no shutdown in state SMC_LISTEN 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 Signed-off-by: David S. Miller --- diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 05e4ffe5aabde..1288c7bf40d55 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -1397,8 +1397,7 @@ 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) &&