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usbip: prevent bind loops on devices attached to vhci_hcd 

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.

Cc: stable@vger.kernel.org
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuah Khan 2018-01-17 12:07:30 -07:00 committed by Greg Kroah-Hartman
parent f0b4198f07
commit ef54cf0c60
1 changed files with 9 additions and 0 deletions
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9
tools/usb/usbip/src/usbip_bind.c
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@ -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);