drm: drm_ioctl.c sync with fixes from CVS

Apply the fixes from CVS that were outstanding for this file

Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/drm_ioctl.c

@@ -137,17 +137,22 @@ int drm_setunique(struct inode *inode, struct file *filp,
 
 static int drm_set_busid(drm_device_t * dev)
 {
+	int len;
+
 	if (dev->unique != NULL)
 		return EBUSY;
 
-	dev->unique_len = 20;
+	dev->unique_len = 40;
 	dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
 	if (dev->unique == NULL)
 		return ENOMEM;
 
-	snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
+	len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
 		 dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func);
 
+	if (len > dev->unique_len)
+		DRM_ERROR("Unique buffer overflowed\n");
+
 	dev->devname =
 	    drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
 		      2, DRM_MEM_DRIVER);
@@ -239,7 +244,7 @@ int drm_getclient(struct inode *inode, struct file *filp,
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->head->dev;
-	drm_client_t __user *argp = (void __user *)arg;
+	drm_client_t __user *argp = (drm_client_t __user *)arg;
 	drm_client_t client;
 	drm_file_t *pt;
 	int idx;
@@ -262,7 +267,7 @@ int drm_getclient(struct inode *inode, struct file *filp,
 	client.iocs = pt->ioctl_count;
 	up(&dev->struct_sem);
 
-	if (copy_to_user((drm_client_t __user *) arg, &client, sizeof(client)))
+	if (copy_to_user(argp, &client, sizeof(client)))
 		return -EFAULT;
 	return 0;
 }
@@ -339,7 +344,7 @@ int drm_setversion(DRM_IOCTL_ARGS)
 		if (sv.drm_di_major != DRM_IF_MAJOR ||
 		    sv.drm_di_minor < 0 || sv.drm_di_minor > DRM_IF_MINOR)
 			return EINVAL;
-		if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_dd_minor);
+		if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_di_minor);
 		dev->if_version = DRM_MAX(if_version, dev->if_version);
 		if (sv.drm_di_minor >= 1) {
 			/*