Commit 96ea4192 authored Jan 17, 2018 by Shuah Khan Committed by Greg Kroah-Hartman Feb 07, 2018

usbip: prevent bind loops on devices attached to vhci_hcd



commit ef54cf0c600fb8f5737fb001a9e357edda1a1de8 upstream.

usbip host binds to devices attached to vhci_hcd on the same server
when user does attach over localhost or specifies the server as the
remote.

usbip attach -r localhost -b busid
or
usbip attach -r servername (or server IP)

Unbind followed by bind works, however device is left in a bad state with
accesses via the attached busid result in errors and system hangs during
shutdown.

Fix it to check and bail out if the device is already attached to vhci_hcd.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 464bab18

tools/usb/usbip/src/usbip_bind.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -144,6 +144,7 @@ static int bind_device(char *busid)
		int rc;
		struct udev *udev;
		struct udev_device *dev;
		const char *devpath;

		/* Check whether the device with this bus ID exists. */
		udev = udev_new();
		@@ -152,8 +153,16 @@ static int bind_device(char *busid)
		err("device with the specified bus ID does not exist");
		return -1;
		}
		devpath = udev_device_get_devpath(dev);
		udev_unref(udev);

		/* If the device is already attached to vhci_hcd - bail out */
		if (strstr(devpath, USBIP_VHCI_DRV_NAME)) {
		err("bind loop detected: device: %s is attached to %s\n",
		devpath, USBIP_VHCI_DRV_NAME);
		return -1;
		}

		rc = unbind_other(busid);
		if (rc == UNBIND_ST_FAILED) {
		err("could not unbind driver from device on busid %s", busid);