Fix a potential NULL pointer dereference in write_bulk_callback() in drivers/net...

This patch fixes a potential null dereference bug where we dereference
pegasus before a null check. This patch simply moves the dereferencing
after the null check.

Signed-off-by: Micah Gruber <micah.gruber@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index a05fd97..04cba6b 100644 (file)
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -768,11 +768,13 @@ done:
 static void write_bulk_callback(struct urb *urb)
 {
        pegasus_t *pegasus = urb->context;
-       struct net_device *net = pegasus->net;
+       struct net_device *net;
 
        if (!pegasus)
                return;
 
+       net = pegasus->net;
+
        if (!netif_device_present(net) || !netif_running(net))
                return;