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Subject[PATCH net 1/3] net/smc: no shutdown in state SMC_LISTEN
Date
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>
---
net/smc/af_smc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 05e4ffe5aabd..1288c7bf40d5 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) &&
--
2.16.4
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