smc->clcsock and smc->clcsock->sk are used before the check if they can
be dereferenced. Fix this by checking the variables first.
Fixes: a60a2b1e0af1 ("net/smc: reduce active tcp_listen workers")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Karsten Graul <kgraul@xxxxxxxxxxxxx>
---
net/smc/smc_close.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c
index 10d05a6d34fc..0f9ffba07d26 100644
--- a/net/smc/smc_close.c
+++ b/net/smc/smc_close.c
@@ -208,11 +208,12 @@ int smc_close_active(struct smc_sock *smc)
break;
case SMC_LISTEN:
sk->sk_state = SMC_CLOSED;
- smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
- smc->clcsock->sk->sk_user_data = NULL;
sk->sk_state_change(sk); /* wake up accept */
- if (smc->clcsock && smc->clcsock->sk)
+ if (smc->clcsock && smc->clcsock->sk) {
+ smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
+ smc->clcsock->sk->sk_user_data = NULL;
rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
+ }
smc_close_cleanup_listen(sk);
release_sock(sk);
flush_work(&smc->tcp_listen_work);
--
2.17.1
