From: Ursula Braun Date: Fri, 2 Aug 2019 08:16:38 +0000 (+0200) Subject: net/smc: do not schedule tx_work in SMC_CLOSED state X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f9cedf1a9b1cdcfb0c52edb391d01771e43994a4;p=openwrt%2Fstaging%2Fblogic.git net/smc: do not schedule tx_work in SMC_CLOSED state The setsockopts options TCP_NODELAY and TCP_CORK may schedule the tx worker. Make sure the socket is not yet moved into SMC_CLOSED state (for instance by a shutdown SHUT_RDWR call). Reported-by: syzbot+92209502e7aab127c75f@syzkaller.appspotmail.com Reported-by: syzbot+b972214bb803a343f4fe@syzkaller.appspotmail.com Fixes: 01d2f7e2cdd31 ("net/smc: sockopts TCP_NODELAY and TCP_CORK") Signed-off-by: Ursula Braun Signed-off-by: Karsten Graul Signed-off-by: David S. Miller --- diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 302e355f2ebc..f5ea09258ab0 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -1732,14 +1732,18 @@ static int smc_setsockopt(struct socket *sock, int level, int optname, } break; case TCP_NODELAY: - if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { + if (sk->sk_state != SMC_INIT && + sk->sk_state != SMC_LISTEN && + sk->sk_state != SMC_CLOSED) { if (val && !smc->use_fallback) mod_delayed_work(system_wq, &smc->conn.tx_work, 0); } break; case TCP_CORK: - if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { + if (sk->sk_state != SMC_INIT && + sk->sk_state != SMC_LISTEN && + sk->sk_state != SMC_CLOSED) { if (!val && !smc->use_fallback) mod_delayed_work(system_wq, &smc->conn.tx_work, 0);