Merge "Fix heap-buffer-overflow detected by ASAN."

    if (!avcr) return DIFFERENT;

    lenr -= avcr - msgr;

    if (lenl != lenr) return DIFFERENT;

    if (fastcmp<memcmp>(avcl + strlen(avc), avcr + strlen(avc), lenl))

    // TODO: After b/35468874 is addressed, revisit "lenl > strlen(avc)"

    // condition, it might become superflous.

    if (lenl > strlen(avc) &&

        fastcmp<memcmp>(avcl + strlen(avc), avcr + strlen(avc),

                        lenl - strlen(avc))) {

        return DIFFERENT;

    }

    return SAME;

}