Re: [PATCH] USB: serial: option: add interface-number sanity check to flag handling

[Johan Hovold]

On Wed, Dec 09, 2020 at 11:52:45AM +0100, Greg Kroah-Hartman wrote:
> On Wed, Dec 09, 2020 at 11:42:21AM +0100, Johan Hovold wrote:
> > Add an interface-number sanity check before testing the device flags to
> > avoid relying on undefined behaviour when left shifting in case a device
> > uses an interface number greater than or equal to BITS_PER_LONG (i.e. 64
> > or 32).
> > 
> > Reported-by: syzbot+8881b478dad0a7971f79@xxxxxxxxxxxxxxxxxxxxxxxxx
> > Fixes: c3a65808f04a ("USB: serial: option: reimplement interface masking")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
> 
> Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

Thanks for reviewing. Now applied.

Johan