From: Abhishek Pandit-Subedi <abhishekpandit@xxxxxxxxxxxx>
[ Upstream commit 4b8af331bb4d4cc8bb91c284b11b98dd1e265185 ]
Suspend notifier should only be registered and unregistered once per
hdev. Simplify this by only registering during driver registration and
simply exiting early when HCI_USER_CHANNEL is set.
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Fixes: 359ee4f834f5 (Bluetooth: Unregister suspend with userchannel)
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@xxxxxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/bluetooth/hci_core.c | 4 ++++
net/bluetooth/hci_sock.c | 3 ---
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index e6be18eb7fe6..6ae5aa5c0927 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2400,6 +2400,10 @@ static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action,
container_of(nb, struct hci_dev, suspend_notifier);
int ret = 0;
+ /* Userspace has full control of this device. Do nothing. */
+ if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL))
+ return NOTIFY_DONE;
+
if (action == PM_SUSPEND_PREPARE)
ret = hci_suspend_dev(hdev);
else if (action == PM_POST_SUSPEND)
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 0d015d4a8e41..bd8358b44aa4 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -887,7 +887,6 @@ static int hci_sock_release(struct socket *sock)
*/
hci_dev_do_close(hdev);
hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
- hci_register_suspend_notifier(hdev);
mgmt_index_added(hdev);
}
@@ -1216,7 +1215,6 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
}
mgmt_index_removed(hdev);
- hci_unregister_suspend_notifier(hdev);
err = hci_dev_open(hdev->id);
if (err) {
@@ -1231,7 +1229,6 @@ static int hci_sock_bind(struct socket *sock, struct sockaddr *addr,
err = 0;
} else {
hci_dev_clear_flag(hdev, HCI_USER_CHANNEL);
- hci_register_suspend_notifier(hdev);
mgmt_index_added(hdev);
hci_dev_put(hdev);
goto done;
--
2.35.1
