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caif_usb: Check driver name before reading driver state in netdev notifier 

In cfusbl_device_notify(), the usbnet and usbdev variables are
initialised before the driver name has been checked.  In case the
device's driver is not cdc_ncm, this may result in reading beyond the
end of the netdev private area.  Move the initialisation below the
driver name check.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2012-12-07 06:17:26 +00:00 committed by David S. Miller
parent d73bcd2c28
commit 406636340c
1 changed files with 5 additions and 2 deletions
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7
net/caif/caif_usb.c
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@ -126,8 +126,8 @@ static int cfusbl_device_notify(struct notifier_block *me, unsigned long what,
struct net_device *dev = arg;
struct caif_dev_common common;
struct cflayer *layer, *link_support;
struct usbnet *usbnet = netdev_priv(dev);
struct usb_device *usbdev = usbnet->udev;
struct usbnet *usbnet;
struct usb_device *usbdev;
struct ethtool_drvinfo drvinfo;
/*
@ -141,6 +141,9 @@ static int cfusbl_device_notify(struct notifier_block *me, unsigned long what,
if (strncmp(drvinfo.driver, "cdc_ncm", 7) != 0)
return 0;
usbnet = netdev_priv(dev);
usbdev = usbnet->udev;
pr_debug("USB CDC NCM device VID:0x%4x PID:0x%4x\n",
le16_to_cpu(usbdev->descriptor.idVendor),
le16_to_cpu(usbdev->descriptor.idProduct));