static void vp7_get_quants(VP8Context *s)
{
    VP56RangeCoder *c = &s->c;

    int yac_qi  = vp8_rac_get_uint(c, 7);
    int ydc_qi  = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int y2dc_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int y2ac_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int uvdc_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
    int uvac_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;

    s->qmat[0].luma_qmul[0]    =       vp7_ydc_qlookup[ydc_qi];
    s->qmat[0].luma_qmul[1]    =       vp7_yac_qlookup[yac_qi];
    s->qmat[0].luma_dc_qmul[0] =       vp7_y2dc_qlookup[y2dc_qi];
    s->qmat[0].luma_dc_qmul[1] =       vp7_y2ac_qlookup[y2ac_qi];
    s->qmat[0].chroma_qmul[0]  = FFMIN(vp7_ydc_qlookup[uvdc_qi], 132);
    s->qmat[0].chroma_qmul[1]  =       vp7_yac_qlookup[uvac_qi];
}

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.