On Tue, Oct 08, 2019 at 03:14:16PM +0200, Greg KH wrote: > On Tue, Oct 08, 2019 at 05:57:12AM +0100, Al Viro wrote: > > > > OK... BTW, do you agree that the use of access_ok() in > > drivers/tty/n_hdlc.c:n_hdlc_tty_read() is wrong? It's used as an early > > cutoff, so we don't bother waiting if user has passed an obviously bogus > > address. copy_to_user() is used for actual copying there... > > Yes, it's wrong, and not needed. I'll go rip it out unless you want to? I'll throw it into misc queue for now; it has no prereqs and nothing is going to depend upon it. While looking for more of the same pattern: usb_device_read(). Frankly, usb_device_dump() calling conventions look ugly - it smells like it would be much happier as seq_file. Iterator would take some massage, but that seems to be doable. Anyway, that's a separate story...
