USB: serial: garmin_gps: add sanity checking for data length
We must not process packets shorter than a packet ID Signed-off-by: Oliver Neukum <oneukum@suse.com> Reported-and-tested-by: <syzbot+d29e9263e13ce0b9f4fd@syzkaller.appspotmail.com> Fixes: 1da177e4 ("Linux-2.6.12-rc2") Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org>