static void pcnet_init(PCNetState *s)
{
    int rlen, tlen;
    uint16_t padr[3], ladrf[4], mode;
    uint32_t rdra, tdra;

    trace_pcnet_init(s, PHYSADDR(s, CSR_IADR(s)));

    if (BCR_SSIZE32(s)) {
        struct pcnet_initblk32 initblk;
        s->phys_mem_read(s->dma_opaque, PHYSADDR(s,CSR_IADR(s)),
                (uint8_t *)&initblk, sizeof(initblk), 0);
        mode = le16_to_cpu(initblk.mode);
        rlen = initblk.rlen >> 4;
        tlen = initblk.tlen >> 4;
	ladrf[0] = le16_to_cpu(initblk.ladrf[0]);
	ladrf[1] = le16_to_cpu(initblk.ladrf[1]);
	ladrf[2] = le16_to_cpu(initblk.ladrf[2]);
	ladrf[3] = le16_to_cpu(initblk.ladrf[3]);
	padr[0] = le16_to_cpu(initblk.padr[0]);
	padr[1] = le16_to_cpu(initblk.padr[1]);
	padr[2] = le16_to_cpu(initblk.padr[2]);
        rdra = le32_to_cpu(initblk.rdra);
        tdra = le32_to_cpu(initblk.tdra);
    } else {
        struct pcnet_initblk16 initblk;
        s->phys_mem_read(s->dma_opaque, PHYSADDR(s,CSR_IADR(s)),
                (uint8_t *)&initblk, sizeof(initblk), 0);
        mode = le16_to_cpu(initblk.mode);
	ladrf[0] = le16_to_cpu(initblk.ladrf[0]);
	ladrf[1] = le16_to_cpu(initblk.ladrf[1]);
	ladrf[2] = le16_to_cpu(initblk.ladrf[2]);
	ladrf[3] = le16_to_cpu(initblk.ladrf[3]);
	padr[0] = le16_to_cpu(initblk.padr[0]);
	padr[1] = le16_to_cpu(initblk.padr[1]);
	padr[2] = le16_to_cpu(initblk.padr[2]);
        rdra = le32_to_cpu(initblk.rdra);
        tdra = le32_to_cpu(initblk.tdra);
        rlen = rdra >> 29;
        tlen = tdra >> 29;
        rdra &= 0x00ffffff;
        tdra &= 0x00ffffff;
    }

    trace_pcnet_rlen_tlen(s, rlen, tlen);

    CSR_RCVRL(s) = (rlen < 9) ? (1 << rlen) : 512;
    CSR_XMTRL(s) = (tlen < 9) ? (1 << tlen) : 512;
    s->csr[ 6] = (tlen << 12) | (rlen << 8);
    s->csr[15] = mode;
    s->csr[ 8] = ladrf[0];
    s->csr[ 9] = ladrf[1];
    s->csr[10] = ladrf[2];
    s->csr[11] = ladrf[3];
    s->csr[12] = padr[0];
    s->csr[13] = padr[1];
    s->csr[14] = padr[2];
    s->rdra = PHYSADDR(s, rdra);
    s->tdra = PHYSADDR(s, tdra);

    CSR_RCVRC(s) = CSR_RCVRL(s);
    CSR_XMTRC(s) = CSR_XMTRL(s);

    trace_pcnet_ss32_rdra_tdra(s, BCR_SSIZE32(s),
                               s->rdra, CSR_RCVRL(s), s->tdra, CSR_XMTRL(s));

    s->csr[0] |= 0x0101;
    s->csr[0] &= ~0x0004;       /* clear STOP bit */

    qemu_flush_queued_packets(qemu_get_queue(s->nic));
}

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.