[PATCH] ds_ioctl.c usercopy check

Patch adds a check of the return value and returns -EFAULT if
__copy_to_user fails.
Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/pcmcia/ds.c

@@ -1060,7 +1060,11 @@ static int ds_ioctl(struct inode * inode, struct file * file,
 	}
     }
 
-    if (cmd & IOC_OUT) __copy_to_user(uarg, (char *)&buf, size);
+    if (cmd & IOC_OUT) {
+        if (__copy_to_user(uarg, (char *)&buf, size))
+            err = -EFAULT;
+    }
+
 
     return err;
 } /* ds_ioctl */