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

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@syzkaller.appspotmail.com Fixes: c3a65808f04a ("USB: serial: option: reimplement interface masking") Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold johan@kernel.org

Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org