void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f,
                      int mb_x, int mb_y)
{
    int mbedge_lim, bedge_lim;
    int filter_level = f->filter_level;
    int inner_limit  = f->inner_limit;
    int inner_filter = f->inner_filter;
    ptrdiff_t linesize = s->linesize;

    if (!filter_level)
        return;

    bedge_lim  = 2 * filter_level + inner_limit;
    mbedge_lim = bedge_lim + 4;

    if (mb_x)
        s->vp8dsp.vp8_h_loop_filter_simple(dst, linesize, mbedge_lim);
    if (inner_filter) {
        s->vp8dsp.vp8_h_loop_filter_simple(dst +  4, linesize, bedge_lim);
        s->vp8dsp.vp8_h_loop_filter_simple(dst +  8, linesize, bedge_lim);
        s->vp8dsp.vp8_h_loop_filter_simple(dst + 12, linesize, bedge_lim);
    }

    if (mb_y)
        s->vp8dsp.vp8_v_loop_filter_simple(dst, linesize, mbedge_lim);
    if (inner_filter) {
        s->vp8dsp.vp8_v_loop_filter_simple(dst +  4 * linesize, linesize, bedge_lim);
        s->vp8dsp.vp8_v_loop_filter_simple(dst +  8 * linesize, linesize, bedge_lim);
        s->vp8dsp.vp8_v_loop_filter_simple(dst + 12 * linesize, linesize, bedge_lim);
    }
}

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.