brcmf_cfg80211_escan_handler(struct brcmf_if *ifp,
			     const struct brcmf_event_msg *e, void *data)
{
	struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
	s32 status;
	struct brcmf_escan_result_le *escan_result_le;
	struct brcmf_bss_info_le *bss_info_le;
	struct brcmf_bss_info_le *bss = NULL;
	u32 bi_length;
	struct brcmf_scan_results *list;
	u32 i;
	bool aborted;

	status = e->status;

	if (!test_bit(BRCMF_SCAN_STATUS_BUSY, &cfg->scan_status)) {
		brcmf_err("scan not ready, bsscfgidx=%d\n", ifp->bsscfgidx);
		return -EPERM;
	}

	if (status == BRCMF_E_STATUS_PARTIAL) {
		brcmf_dbg(SCAN, "ESCAN Partial result\n");
		escan_result_le = (struct brcmf_escan_result_le *) data;
		if (!escan_result_le) {
			brcmf_err("Invalid escan result (NULL pointer)\n");
			goto exit;
		}
		if (le16_to_cpu(escan_result_le->bss_count) != 1) {
			brcmf_err("Invalid bss_count %d: ignoring\n",
				  escan_result_le->bss_count);
			goto exit;
		}
		bss_info_le = &escan_result_le->bss_info_le;

		if (brcmf_p2p_scan_finding_common_channel(cfg, bss_info_le))
			goto exit;

		if (!cfg->scan_request) {
			brcmf_dbg(SCAN, "result without cfg80211 request\n");
			goto exit;
		}

		bi_length = le32_to_cpu(bss_info_le->length);
		if (bi_length != (le32_to_cpu(escan_result_le->buflen) -
					WL_ESCAN_RESULTS_FIXED_SIZE)) {
			brcmf_err("Invalid bss_info length %d: ignoring\n",
				  bi_length);
			goto exit;
		}

		if (!(cfg_to_wiphy(cfg)->interface_modes &
					BIT(NL80211_IFTYPE_ADHOC))) {
			if (le16_to_cpu(bss_info_le->capability) &
						WLAN_CAPABILITY_IBSS) {
				brcmf_err("Ignoring IBSS result\n");
				goto exit;
			}
		}

		list = (struct brcmf_scan_results *)
				cfg->escan_info.escan_buf;
		if (bi_length > BRCMF_ESCAN_BUF_SIZE - list->buflen) {
			brcmf_err("Buffer is too small: ignoring\n");
			goto exit;
		}

		for (i = 0; i < list->count; i++) {
			bss = bss ? (struct brcmf_bss_info_le *)
				((unsigned char *)bss +
				le32_to_cpu(bss->length)) : list->bss_info_le;
			if (brcmf_compare_update_same_bss(cfg, bss,
							  bss_info_le))
				goto exit;
		}
		memcpy(&cfg->escan_info.escan_buf[list->buflen], bss_info_le,
		       bi_length);
		list->version = le32_to_cpu(bss_info_le->version);
		list->buflen += bi_length;
		list->count++;
	} else {
		cfg->escan_info.escan_state = WL_ESCAN_STATE_IDLE;
		if (brcmf_p2p_scan_finding_common_channel(cfg, NULL))
			goto exit;
		if (cfg->scan_request) {
			brcmf_inform_bss(cfg);
			aborted = status != BRCMF_E_STATUS_SUCCESS;
			brcmf_notify_escan_complete(cfg, ifp, aborted, false);
		} else
			brcmf_dbg(SCAN, "Ignored scan complete result 0x%x\n",
				  status);
	}
exit:
	return 0;
}

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.