[PATCH net-next 1/2] caif_usb: Check driver name before reading driver state in netdev notifier
From: Ben Hutchings <hidden>
Date: 2012-12-07 16:17:29
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- Compile-tested only. Ben. net/caif/caif_usb.c | 7 +++++-- 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));
--
1.7.7.6
--
Ben Hutchings, Staff Engineer, Solarflare
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