static void tg3_poll_link(struct tg3 *tp)
{
	/* handle link change and other phy events */
	if (!(tg3_flag(tp, USE_LINKCHG_REG) || tg3_flag(tp, POLL_SERDES))) {
		struct tg3_hw_status *sblk = tp->napi[0].hw_status;

		if (sblk->status & SD_STATUS_LINK_CHG) {
			sblk->status = SD_STATUS_UPDATED |
				       (sblk->status & ~SD_STATUS_LINK_CHG);
			spin_lock(&tp->lock);
			if (tg3_flag(tp, USE_PHYLIB)) {
				tw32_f(MAC_STATUS,
				     (MAC_STATUS_SYNC_CHANGED |
				      MAC_STATUS_CFG_CHANGED |
				      MAC_STATUS_MI_COMPLETION |
				      MAC_STATUS_LNKSTATE_CHANGED));
				udelay(40);
			} else
				tg3_setup_phy(tp, 0);
			spin_unlock(&tp->lock);
		}
	}
}

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.