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From:   Shuah Khan <shuahkh@osg.samsung.com>
To:     valentina.manea.m@gmail.com, shuah@kernel.org,
        gregkh@linuxfoundation.org
Cc:     Shuah Khan <shuahkh@osg.samsung.com>, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH] usbip: keep usbip_device sockfd state in sync with tcp_socket
Date:   Fri, 26 Jan 2018 11:56:50 -0700
Message-Id: <20180126185650.15752-1-shuahkh@osg.samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Keep usbip_device sockfd state in sync with tcp_socket. When tcp_socket
is reset to null, reset sockfd to -1 to keep it in sync.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Cc: stable@vger.kernel.org
---
 drivers/usb/usbip/stub_dev.c | 3 +++
 drivers/usb/usbip/vhci_hcd.c | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index e31a6f204397..86037e5b1101 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -73,6 +73,7 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
 			goto err;
 
 		sdev->ud.tcp_socket = socket;
+		sdev->ud.sockfd = sockfd;
 
 		spin_unlock_irq(&sdev->ud.lock);
 
@@ -172,6 +173,7 @@ static void stub_shutdown_connection(struct usbip_device *ud)
 	if (ud->tcp_socket) {
 		sockfd_put(ud->tcp_socket);
 		ud->tcp_socket = NULL;
+		ud->sockfd = -1;
 	}
 
 	/* 3. free used data */
@@ -266,6 +268,7 @@ static struct stub_device *stub_device_alloc(struct usb_device *udev)
 	sdev->ud.status		= SDEV_ST_AVAILABLE;
 	spin_lock_init(&sdev->ud.lock);
 	sdev->ud.tcp_socket	= NULL;
+	sdev->ud.sockfd		= -1;
 
 	INIT_LIST_HEAD(&sdev->priv_init);
 	INIT_LIST_HEAD(&sdev->priv_tx);
diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index c3e1008aa491..20e3d4609583 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -984,6 +984,7 @@ static void vhci_shutdown_connection(struct usbip_device *ud)
 	if (vdev->ud.tcp_socket) {
 		sockfd_put(vdev->ud.tcp_socket);
 		vdev->ud.tcp_socket = NULL;
+		vdev->ud.sockfd = -1;
 	}
 	pr_info("release socket\n");
 
@@ -1030,6 +1031,7 @@ static void vhci_device_reset(struct usbip_device *ud)
 	if (ud->tcp_socket) {
 		sockfd_put(ud->tcp_socket);
 		ud->tcp_socket = NULL;
+		ud->sockfd = -1;
 	}
 	ud->status = VDEV_ST_NULL;
 
-- 
2.14.1