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USB: usb_driver_claim_interface: add sanity checking

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Attacks that trick drivers into passing a NULL pointer
to usb_driver_claim_interface() using forged descriptors are
known. This thwarts them by sanity checking.

Signed-off-by: Oliver Neukum <ONeukum@suse.com>
CC: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum
2016-03-16 13:26:17 +01:00
committed by Greg Kroah-Hartman
parent 7222c83225
commit 0b818e3956
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/core/driver.c
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@@ -502,11 +502,15 @@ static int usb_unbind_interface(struct device *dev)
int usb_driver_claim_interface(struct usb_driver *driver, int usb_driver_claim_interface(struct usb_driver *driver,
struct usb_interface *iface, void *priv) struct usb_interface *iface, void *priv)
{ {
struct device *dev = &iface->dev; struct device *dev;
struct usb_device *udev; struct usb_device *udev;
int retval = 0; int retval = 0;
int lpm_disable_error; int lpm_disable_error;
if (!iface)
return -ENODEV;
dev = &iface->dev;
if (dev->driver) if (dev->driver)
return -EBUSY; return -EBUSY;