static s32 brcmf_update_bss_info(struct brcmf_cfg80211_info *cfg,
				 struct brcmf_if *ifp)
{
	struct brcmf_bss_info_le *bi;
	const struct brcmf_tlv *tim;
	u16 beacon_interval;
	u8 dtim_period;
	size_t ie_len;
	u8 *ie;
	s32 err = 0;

	brcmf_dbg(TRACE, "Enter\n");
	if (brcmf_is_ibssmode(ifp->vif))
		return err;

	*(__le32 *)cfg->extra_buf = cpu_to_le32(WL_EXTRA_BUF_MAX);
	err = brcmf_fil_cmd_data_get(ifp, BRCMF_C_GET_BSS_INFO,
				     cfg->extra_buf, WL_EXTRA_BUF_MAX);
	if (err) {
		brcmf_err("Could not get bss info %d\n", err);
		goto update_bss_info_out;
	}

	bi = (struct brcmf_bss_info_le *)(cfg->extra_buf + 4);
	err = brcmf_inform_single_bss(cfg, bi);
	if (err)
		goto update_bss_info_out;

	ie = ((u8 *)bi) + le16_to_cpu(bi->ie_offset);
	ie_len = le32_to_cpu(bi->ie_length);
	beacon_interval = le16_to_cpu(bi->beacon_period);

	tim = brcmf_parse_tlvs(ie, ie_len, WLAN_EID_TIM);
	if (tim)
		dtim_period = tim->data[1];
	else {
		/*
		* active scan was done so we could not get dtim
		* information out of probe response.
		* so we speficially query dtim information to dongle.
		*/
		u32 var;
		err = brcmf_fil_iovar_int_get(ifp, "dtim_assoc", &var);
		if (err) {
			brcmf_err("wl dtim_assoc failed (%d)\n", err);
			goto update_bss_info_out;
		}
		dtim_period = (u8)var;
	}

update_bss_info_out:
	brcmf_dbg(TRACE, "Exit");
	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.