Bluetooth: Do not dereference zero sk

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 16360298590f..138fe3446678 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -795,7 +795,7 @@ static void l2cap_sock_kill(struct sock *sk)
 static int l2cap_sock_shutdown(struct socket *sock, int how)
 {
         struct sock *sk = sock->sk;
-        struct l2cap_chan *chan = l2cap_pi(sk)->chan;
+        struct l2cap_chan *chan;
         int err = 0;
 
         BT_DBG("sock %p, sk %p", sock, sk);
@@ -803,6 +803,8 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
         if (!sk)
                 return 0;
 
+        chan = l2cap_pi(sk)->chan;
+
         lock_sock(sk);
         if (!sk->sk_shutdown) {
                 if (chan->mode == L2CAP_MODE_ERTM)