static OPJ_BOOL opj_tcd_code_block_dec_allocate(opj_tcd_cblk_dec_t *
        p_code_block)
{
    if (! p_code_block->segs) {

        p_code_block->segs = (opj_tcd_seg_t *) opj_calloc(OPJ_J2K_DEFAULT_NB_SEGS,
                             sizeof(opj_tcd_seg_t));
        if (! p_code_block->segs) {
            return OPJ_FALSE;
        }
        /*fprintf(stderr, "Allocate %d elements of code_block->data\n", OPJ_J2K_DEFAULT_NB_SEGS * sizeof(opj_tcd_seg_t));*/

        p_code_block->m_current_max_segs = OPJ_J2K_DEFAULT_NB_SEGS;
        /*fprintf(stderr, "m_current_max_segs of code_block->data = %d\n", p_code_block->m_current_max_segs);*/
    } else {
        /* sanitize */
        opj_tcd_seg_t * l_segs = p_code_block->segs;
        OPJ_UINT32 l_current_max_segs = p_code_block->m_current_max_segs;
        opj_tcd_seg_data_chunk_t* l_chunks = p_code_block->chunks;
        OPJ_UINT32 l_numchunksalloc = p_code_block->numchunksalloc;
        OPJ_UINT32 i;

        memset(p_code_block, 0, sizeof(opj_tcd_cblk_dec_t));
        p_code_block->segs = l_segs;
        p_code_block->m_current_max_segs = l_current_max_segs;
        for (i = 0; i < l_current_max_segs; ++i) {
            opj_tcd_reinit_segment(&l_segs[i]);
        }
        p_code_block->chunks = l_chunks;
        p_code_block->numchunksalloc = l_numchunksalloc;
    }

    return OPJ_TRUE;
}

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.