void inter_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                   VP8Macroblock *mb, int mb_x, int mb_y)
{
    int x_off = mb_x << 4, y_off = mb_y << 4;
    int width = 16 * s->mb_width, height = 16 * s->mb_height;
    ThreadFrame *ref = &s->framep[mb->ref_frame]->tf;
    VP56mv *bmv = mb->bmv;

    switch (mb->partitioning) {
    case VP8_SPLITMVMODE_NONE:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 16, 16, width, height, &mb->mv);
        break;
    case VP8_SPLITMVMODE_4x4: {
        int x, y;
        VP56mv uvmv;

        /* Y */
        for (y = 0; y < 4; y++) {
            for (x = 0; x < 4; x++) {
                vp8_mc_luma(s, td, dst[0] + 4 * y * s->linesize + x * 4,
                            ref, &bmv[4 * y + x],
                            4 * x + x_off, 4 * y + y_off, 4, 4,
                            width, height, s->linesize,
                            s->put_pixels_tab[2]);
            }
        }

        /* U/V */
        x_off  >>= 1;
        y_off  >>= 1;
        width  >>= 1;
        height >>= 1;
        for (y = 0; y < 2; y++) {
            for (x = 0; x < 2; x++) {
                uvmv.x = mb->bmv[2 * y       * 4 + 2 * x    ].x +
                         mb->bmv[2 * y       * 4 + 2 * x + 1].x +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x    ].x +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x + 1].x;
                uvmv.y = mb->bmv[2 * y       * 4 + 2 * x    ].y +
                         mb->bmv[2 * y       * 4 + 2 * x + 1].y +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x    ].y +
                         mb->bmv[(2 * y + 1) * 4 + 2 * x + 1].y;
                uvmv.x = (uvmv.x + 2 + FF_SIGNBIT(uvmv.x)) >> 2;
                uvmv.y = (uvmv.y + 2 + FF_SIGNBIT(uvmv.y)) >> 2;
                if (s->profile == 3) {
                    uvmv.x &= ~7;
                    uvmv.y &= ~7;
                }
                vp8_mc_chroma(s, td, dst[1] + 4 * y * s->uvlinesize + x * 4,
                              dst[2] + 4 * y * s->uvlinesize + x * 4, ref,
                              &uvmv, 4 * x + x_off, 4 * y + y_off, 4, 4,
                              width, height, s->uvlinesize,
                              s->put_pixels_tab[2]);
            }
        }
        break;
    }
    case VP8_SPLITMVMODE_16x8:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 16, 8, width, height, &bmv[0]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 8, 16, 8, width, height, &bmv[1]);
        break;
    case VP8_SPLITMVMODE_8x16:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 8, 16, width, height, &bmv[0]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    8, 0, 8, 16, width, height, &bmv[1]);
        break;
    case VP8_SPLITMVMODE_8x8:
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 0, 8, 8, width, height, &bmv[0]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    8, 0, 8, 8, width, height, &bmv[1]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    0, 8, 8, 8, width, height, &bmv[2]);
        vp8_mc_part(s, td, dst, ref, x_off, y_off,
                    8, 8, 8, 8, width, height, &bmv[3]);
        break;
    }
}

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.