linux-kernel - [PATCH 4.4 23/59] Bluetooth: btusb: fix PM leak in error case of setup

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Date:   Sat, 11 Jan 2020 10:49:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 4.4 23/59] Bluetooth: btusb: fix PM leak in error case of setup

From: Oliver Neukum <oneukum@...e.com>

commit 3d44a6fd0775e6215e836423e27f8eedf8c871ea upstream.

If setup() fails a reference for runtime PM has already
been taken. Proper use of the error handling in btusb_open()is needed.
You cannot just return.

Fixes: ace31982585a3 ("Bluetooth: btusb: Add setup callback for chip init on USB")
Signed-off-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/bluetooth/btusb.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1056,7 +1056,7 @@ static int btusb_open(struct hci_dev *hd
 	if (data->setup_on_usb) {
 		err = data->setup_on_usb(hdev);
 		if (err < 0)
-			return err;
+			goto setup_fail;
 	}
 
 	err = usb_autopm_get_interface(data->intf);
@@ -1092,6 +1092,7 @@ done:
 
 failed:
 	clear_bit(BTUSB_INTR_RUNNING, &data->flags);
+setup_fail:
 	usb_autopm_put_interface(data->intf);
 	return err;
 }