wifi: mac80211: check basic rates validity

commit ce04abc3 upstream.

When userspace sets basic rates, it might send us some rates
list that's empty or consists of invalid values only. We're
currently ignoring invalid values and then may end up with a
rates bitmap that's empty, which later results in a warning.

Reject the call if there were no valid rates.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reported-by:  <syzbot+19013115c9786bfd0c4e@syzkaller.appspotmail.com>
Tested-by:  <syzbot+19013115c9786bfd0c4e@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=19013115c9786bfd0c4e


Signed-off-by: Vincenzo Mezzela <vincenzo.mezzela@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>