Code: rio_ioctl (struct net_device *dev, struct ifreq *rq, int cmd)
 {
 	int phy_addr;
 	struct netdev_private *np = netdev_priv(dev);
	struct mii_data *miidata = (struct mii_data *) &rq->ifr_ifru;
	struct netdev_desc *desc;
	int i;
 
 	phy_addr = np->phy_addr;
 	switch (cmd) {
	case SIOCDEVPRIVATE:
		break;
	case SIOCDEVPRIVATE + 1:
		miidata->out_value = mii_read (dev, phy_addr, miidata->reg_num);
 		break;
	case SIOCDEVPRIVATE + 2:
		mii_write (dev, phy_addr, miidata->reg_num, miidata->in_value);
 		break;
	case SIOCDEVPRIVATE + 3:
		break;
	case SIOCDEVPRIVATE + 4:
		break;
	case SIOCDEVPRIVATE + 5:
		netif_stop_queue (dev);
 		break;
	case SIOCDEVPRIVATE + 6:
		netif_wake_queue (dev);
		break;
	case SIOCDEVPRIVATE + 7:
		printk
		    ("tx_full=%x cur_tx=%lx old_tx=%lx cur_rx=%lx old_rx=%lx\n",
		     netif_queue_stopped(dev), np->cur_tx, np->old_tx, np->cur_rx,
		     np->old_rx);
		break;
	case SIOCDEVPRIVATE + 8:
		printk("TX ring:\n");
		for (i = 0; i < TX_RING_SIZE; i++) {
			desc = &np->tx_ring[i];
			printk
			    ("%02x:cur:%08x next:%08x status:%08x frag1:%08x frag0:%08x",
			     i,
			     (u32) (np->tx_ring_dma + i * sizeof (*desc)),
			     (u32)le64_to_cpu(desc->next_desc),
			     (u32)le64_to_cpu(desc->status),
			     (u32)(le64_to_cpu(desc->fraginfo) >> 32),
			     (u32)le64_to_cpu(desc->fraginfo));
			printk ("\n");
		}
		printk ("\n");
		break;
 	default:
 		return -EOPNOTSUPP;
 	}
	return 0;
}

Vulnerability Type: 
CWE ID: CWE-264
Summary: The rio_ioctl function in drivers/net/ethernet/dlink/dl2k.c in the Linux kernel before 3.3.7 does not restrict access to the SIOCSMIIREG command, which allows local users to write data to an Ethernet adapter via an ioctl call.
Commit Message: dl2k: Clean up rio_ioctl

The dl2k driver's rio_ioctl call has a few issues:
- No permissions checking
- Implements SIOCGMIIREG and SIOCGMIIREG using the SIOCDEVPRIVATE numbers
- Has a few ioctls that may have been used for debugging at one point
  but have no place in the kernel proper.

This patch removes all but the MII ioctls, renumbers them to use the
standard ones, and adds the proper permission check for SIOCSMIIREG.

We can also get rid of the dl2k-specific struct mii_data in favor of
the generic struct mii_ioctl_data.

Since we have the phyid on hand, we can add the SIOCGMIIPHY ioctl too.

Most of the MII code for the driver could probably be converted to use
the generic MII library but I don't have a device to test the results.

Reported-by: Stephan Mueller <stephan.mueller@atsec.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>