[PATCH] Fix filp being passed through raw ioctl handler

Don't pass meaningless file handles to block device ioctls.

The recent raw IO ioctl-passthrough fix started passing the raw file
handle into the block device ioctl handler. That's unlikely to be
useful, as the file handle is actually open on a character-mode raw
device, not a block device, so dereferencing it is not going to yield
useful results to a block device ioctl handler.

Previously we just passed NULL; also not a value that can usefully
be dereferenced, but at least if it does happen, we'll oops instead of
silently pretending that the file is a block device, so NULL is the more
defensive option here. This patch reverts to that behaviour.

Noticed by Al Viro.

Signed-off-by: Stephen Tweedie <[e-mail]>
Acked-by: Al Viro <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/raw.c

···
 {
 	struct block_device *bdev = filp->private_data;
 
-	return blkdev_ioctl(bdev->bd_inode, filp, command, arg);
+	return blkdev_ioctl(bdev->bd_inode, NULL, command, arg);
 }
 
 static void bind_device(struct raw_config_request *rq)