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usbip: usbip_host: fix to hold parent lock for device_attach() calls 

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

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuah Khan 2018-04-05 16:29:04 -06:00 committed by Greg Kroah-Hartman
parent 9020a7efe5
commit 4bfb141bc0
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/usbip/stub_main.c
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@ -186,7 +186,12 @@ static ssize_t rebind_store(struct device_driver *dev, const char *buf,
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;