[PATCH 3.18 04/25] usbip: usbip_host: fix to hold parent lock for device_attach() calls

From: Greg Kroah-Hartman
Date: Mon Apr 30 2018 - 15:25:31 EST


3.18-stable review patch. If anyone has any objections, please let me know.

------------------

From: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>

commit 4bfb141bc01312a817d36627cc47c93f801c216d upstream.

usbip_host calls device_attach() without holding dev->parent lock.
Fix it.

Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/usb/usbip/stub_main.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/usb/usbip/stub_main.c
+++ b/drivers/usb/usbip/stub_main.c
@@ -201,7 +201,12 @@ static ssize_t rebind_store(struct devic
if (!bid)
return -ENODEV;

+ /* device_attach() callers should hold parent lock for USB */
+ if (bid->udev->dev.parent)
+ device_lock(bid->udev->dev.parent);
ret = device_attach(&bid->udev->dev);
+ if (bid->udev->dev.parent)
+ device_unlock(bid->udev->dev.parent);
if (ret < 0) {
dev_err(&bid->udev->dev, "rebind failed\n");
return ret;