void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f,
               int mb_x, int mb_y, int is_vp7)
{
    int mbedge_lim, bedge_lim_y, bedge_lim_uv, hev_thresh;
    int filter_level = f->filter_level;
    int inner_limit = f->inner_limit;
    int inner_filter = f->inner_filter;
    ptrdiff_t linesize   = s->linesize;
    ptrdiff_t uvlinesize = s->uvlinesize;
    static const uint8_t hev_thresh_lut[2][64] = {
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
          2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
          3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
          3, 3, 3, 3 },
        { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
          1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
          2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
          2, 2, 2, 2 }
    };

    if (!filter_level)
        return;

    if (is_vp7) {
        bedge_lim_y  = filter_level;
        bedge_lim_uv = filter_level * 2;
        mbedge_lim   = filter_level + 2;
    } else {
        bedge_lim_y  =
        bedge_lim_uv = filter_level * 2 + inner_limit;
        mbedge_lim   = bedge_lim_y + 4;
    }

    hev_thresh = hev_thresh_lut[s->keyframe][filter_level];

    if (mb_x) {
        s->vp8dsp.vp8_h_loop_filter16y(dst[0], linesize,
                                       mbedge_lim, inner_limit, hev_thresh);
        s->vp8dsp.vp8_h_loop_filter8uv(dst[1], dst[2], uvlinesize,
                                       mbedge_lim, inner_limit, hev_thresh);
    }

#define H_LOOP_FILTER_16Y_INNER(cond)                                         \
    if (cond && inner_filter) {                                               \
        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0] +  4, linesize,           \
                                             bedge_lim_y, inner_limit,        \
                                             hev_thresh);                     \
        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0] +  8, linesize,           \
                                             bedge_lim_y, inner_limit,        \
                                             hev_thresh);                     \
        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0] + 12, linesize,           \
                                             bedge_lim_y, inner_limit,        \
                                             hev_thresh);                     \
        s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] +  4, dst[2] + 4,         \
                                             uvlinesize,  bedge_lim_uv,       \
                                             inner_limit, hev_thresh);        \
    }

    H_LOOP_FILTER_16Y_INNER(!is_vp7)

    if (mb_y) {
        s->vp8dsp.vp8_v_loop_filter16y(dst[0], linesize,
                                       mbedge_lim, inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter8uv(dst[1], dst[2], uvlinesize,
                                       mbedge_lim, inner_limit, hev_thresh);
    }

    if (inner_filter) {
        s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0] +  4 * linesize,
                                             linesize, bedge_lim_y,
                                             inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0] +  8 * linesize,
                                             linesize, bedge_lim_y,
                                             inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0] + 12 * linesize,
                                             linesize, bedge_lim_y,
                                             inner_limit, hev_thresh);
        s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] +  4 * uvlinesize,
                                             dst[2] +  4 * uvlinesize,
                                             uvlinesize, bedge_lim_uv,
                                             inner_limit, hev_thresh);
    }

    H_LOOP_FILTER_16Y_INNER(is_vp7)
}

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.