linux-kernel - [PATCH] usbip: usbip_host: fix to hold parent lock for device

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Message-Id: <20180405222904.24420-1-shuahkh@osg.samsung.com>
Date:   Thu,  5 Apr 2018 16:29:04 -0600
From:   Shuah Khan <shuahkh@....samsung.com>
To:     valentina.manea.m@...il.com, shuah@...nel.org,
        gregkh@...uxfoundation.org
Cc:     Shuah Khan <shuahkh@....samsung.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>
Subject: [PATCH] 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@....samsung.com>
Cc: stable <stable@...r.kernel.org>
---
 drivers/usb/usbip/stub_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/usbip/stub_main.c b/drivers/usb/usbip/stub_main.c
index c31c8402a0c5..d41d0cdeec0f 100644
--- a/drivers/usb/usbip/stub_main.c
+++ b/drivers/usb/usbip/stub_main.c
@@ -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;
-- 
2.14.1