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authorBen Hutchings <bhutchings@solarflare.com>2012-12-07 06:17:26 (GMT)
committerDavid S. Miller <davem@davemloft.net>2012-12-09 05:34:02 (GMT)
commit406636340c301b46062b22f94e3815ef767bd6a3 (patch)
tree946f232c1817a5f885824716ee70dbe850c6cb18 /net/caif
parentd73bcd2c28e3c77d9f52d42a45a52455488e287e (diff)
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>
Diffstat (limited to 'net/caif')
-rw-r--r--net/caif/caif_usb.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/caif/caif_usb.c b/net/caif/caif_usb.c
index fd7cbf5..582f80c 100644
--- a/net/caif/caif_usb.c
+++ b/net/caif/caif_usb.c
@@ -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));

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