• Stephen Tweedie's avatar
    [PATCH] Fix filp being passed through raw ioctl handler · e72022e1
    Stephen Tweedie authored
    
    
    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: default avatarStephen Tweedie <sct@redhat.com>
    Acked-by: default avatarAl Viro <viro@parcelfarce.linux.theplanet.co.uk>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    e72022e1