jbig2_decode_generic_region(Jbig2Ctx *ctx,
                            Jbig2Segment *segment, const Jbig2GenericRegionParams *params, Jbig2ArithState *as, Jbig2Image *image, Jbig2ArithCx *GB_stats)
{
    const int8_t *gbat = params->gbat;

    if (image->stride * image->height > (1 << 24) && segment->data_length < image->stride * image->height / 256) {
        return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
                           "region is far larger than data provided (%d << %d), aborting to prevent DOS", segment->data_length, image->stride * image->height);
    }

    if (!params->MMR && params->TPGDON)
        return jbig2_decode_generic_region_TPGDON(ctx, segment, params, as, image, GB_stats);

    if (!params->MMR && params->GBTEMPLATE == 0) {
        if (gbat[0] == +3 && gbat[1] == -1 && gbat[2] == -3 && gbat[3] == -1 && gbat[4] == +2 && gbat[5] == -2 && gbat[6] == -2 && gbat[7] == -2)
            return jbig2_decode_generic_template0(ctx, segment, params, as, image, GB_stats);
        else
            return jbig2_decode_generic_template0_unopt(ctx, segment, params, as, image, GB_stats);
    } else if (!params->MMR && params->GBTEMPLATE == 1)
        return jbig2_decode_generic_template1(ctx, segment, params, as, image, GB_stats);
    else if (!params->MMR && params->GBTEMPLATE == 2) {
        if (gbat[0] == 3 && gbat[1] == -1)
            return jbig2_decode_generic_template2a(ctx, segment, params, as, image, GB_stats);
        else
            return jbig2_decode_generic_template2(ctx, segment, params, as, image, GB_stats);
    } else if (!params->MMR && params->GBTEMPLATE == 3) {
        if (gbat[0] == 2 && gbat[1] == -1)
            return jbig2_decode_generic_template3_unopt(ctx, segment, params, as, image, GB_stats);
        else
            return jbig2_decode_generic_template3_unopt(ctx, segment, params, as, image, GB_stats);
    }

    {
        int i;

        for (i = 0; i < 8; i++)
                    jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number, "gbat[%d] = %d", i, params->gbat[i]);
    }
    jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "decode_generic_region: MMR=%d, GBTEMPLATE=%d NYI", params->MMR, params->GBTEMPLATE);
    return -1;
}

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.