brcmf_cfg80211_config_default_key(struct wiphy *wiphy, struct net_device *ndev,
				  u8 key_idx, bool unicast, bool multicast)
{
	struct brcmf_if *ifp = netdev_priv(ndev);
	u32 index;
	u32 wsec;
	s32 err = 0;

	brcmf_dbg(TRACE, "Enter\n");
	brcmf_dbg(CONN, "key index (%d)\n", key_idx);
	if (!check_vif_up(ifp->vif))
		return -EIO;

	err = brcmf_fil_bsscfg_int_get(ifp, "wsec", &wsec);
	if (err) {
		brcmf_err("WLC_GET_WSEC error (%d)\n", err);
		goto done;
	}

	if (wsec & WEP_ENABLED) {
		/* Just select a new current key */
		index = key_idx;
		err = brcmf_fil_cmd_int_set(ifp,
					    BRCMF_C_SET_KEY_PRIMARY, index);
		if (err)
			brcmf_err("error (%d)\n", err);
	}
done:
	brcmf_dbg(TRACE, "Exit\n");
	return err;
}

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.