static int8_t DRM_aac_scalable_main_header(NeAACDecStruct *hDecoder, ic_stream *ics1, ic_stream *ics2,
                                           bitfile *ld, uint8_t this_layer_stereo)
{
    uint8_t retval = 0;
    uint8_t ch;
    ic_stream *ics;
    uint8_t ics_reserved_bit;

    ics_reserved_bit = faad_get1bit(ld
        DEBUGVAR(1,300,"aac_scalable_main_header(): ics_reserved_bits"));
    if (ics_reserved_bit != 0)
        return 32;
    ics1->window_sequence = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,301,"aac_scalable_main_header(): window_sequence"));
    ics1->window_shape = faad_get1bit(ld
        DEBUGVAR(1,302,"aac_scalable_main_header(): window_shape"));

    if (ics1->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        ics1->max_sfb = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,303,"aac_scalable_main_header(): max_sfb (short)"));
        ics1->scale_factor_grouping = (uint8_t)faad_getbits(ld, 7
            DEBUGVAR(1,304,"aac_scalable_main_header(): scale_factor_grouping"));
    } else {
        ics1->max_sfb = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,305,"aac_scalable_main_header(): max_sfb (long)"));
    }

    /* get the grouping information */
    if ((retval = window_grouping_info(hDecoder, ics1)) > 0)
        return retval;

    /* should be an error */
    /* check the range of max_sfb */
    if (ics1->max_sfb > ics1->num_swb)
        return 16;

    if (this_layer_stereo)
    {
        ics1->ms_mask_present = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,306,"aac_scalable_main_header(): ms_mask_present"));
        if (ics1->ms_mask_present == 3)
        {
            /* bitstream error */
            return 32;
        }
        if (ics1->ms_mask_present == 1)
        {
            uint8_t g, sfb;
            for (g = 0; g < ics1->num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics1->max_sfb; sfb++)
                {
                    ics1->ms_used[g][sfb] = faad_get1bit(ld
                        DEBUGVAR(1,307,"aac_scalable_main_header(): faad_get1bit"));
                }
            }
        }

        memcpy(ics2, ics1, sizeof(ic_stream));
    } else {
        ics1->ms_mask_present = 0;
    }

    return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.