From de0784bdf6314b70c69416d8c576eb83237d5b1e Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Wed, 16 Mar 2016 12:26:17 -0400
Subject: [PATCH] usb_driver_claim_interface: add sanity checking
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
---
drivers/usb/core/driver.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index 6b5063e7943f..e2d242b68d4b 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -500,11 +500,15 @@ static int usb_unbind_interface(struct device *dev)
int usb_driver_claim_interface(struct usb_driver *driver,
struct usb_interface *iface, void *priv)
{
- struct device *dev = &iface->dev;
+ struct device *dev;
struct usb_device *udev;
int retval = 0;
int lpm_disable_error;
+ if (!iface)
+ return -ENODEV;
+
+ dev = &iface->dev;
if (dev->driver)
return -EBUSY;
--
2.5.0