Merge tag 'staging-3.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver tree fix from Greg KH:
 "Here is a single staging driver fix for your tree.

  It resolves an issue with arbritary writes to memory if a specific
  driver is loaded"

* tag 'staging-3.15-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging/cxt1e1/linux.c: Correct arbitrary memory write in c4_ioctl()

drivers/staging/cxt1e1/linux.c

@@ -866,6 +866,8 @@ c4_ioctl (struct net_device *ndev, struct ifreq *ifr, int cmd)
             _IOC_SIZE (iocmd));
 #endif
     iolen = _IOC_SIZE (iocmd);
+    if (iolen > sizeof(arg))
+        return -EFAULT;
     data = ifr->ifr_data + sizeof (iocmd);
     if (copy_from_user (&arg, data, iolen))
         return -EFAULT;