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Date:   Sat, 2 Feb 2019 16:56:36 -0800
From:   Myungho Jung <>
To:     Marcel Holtmann <>,
        Johan Hedberg <>,
        "David S. Miller" <>
Subject: [PATCH] Bluetooth: Fix decrementing reference count twice in
 releasing socket

When releasing socket, it is possible to enter hci_sock_release() and
hci_sock_dev_event(HCI_DEV_UNREG) at the same time in different thread.
The reference count of hdev should be decremented only once from one of
them but if storing hdev to local variable in hci_sock_release() before
detached from socket and setting to NULL in hci_sock_dev_event(),
hci_dev_put(hdev) is unexpectedly called twice. This is resolved by
referencing hdev from socket after bt_sock_unlink() in

Signed-off-by: Myungho Jung <>
 net/bluetooth/hci_sock.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 1506e1632394..d4e2a166ae17 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -831,8 +831,6 @@ static int hci_sock_release(struct socket *sock)
 	if (!sk)
 		return 0;
-	hdev = hci_pi(sk)->hdev;
 	switch (hci_pi(sk)->channel) {
@@ -854,6 +852,7 @@ static int hci_sock_release(struct socket *sock)
 	bt_sock_unlink(&hci_sk_list, sk);
+	hdev = hci_pi(sk)->hdev;
 	if (hdev) {
 		if (hci_pi(sk)->channel == HCI_CHANNEL_USER) {
 			/* When releasing a user channel exclusive access,

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