brcmfmac: add length checks in scheduled scan result handler

Assure the event data buffer is long enough to hold the array
of netinfo items and that SSID length does not exceed the maximum
of 32 characters as per 802.11 spec.
Reviewed-by: NHante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: NFranky Lin <franky.lin@broadcom.com>
Signed-off-by: NArend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

@@ -3300,6 +3300,7 @@ brcmf_notify_sched_scan_results(struct brcmf_if *ifp,
 	struct brcmf_pno_scanresults_le *pfn_result;
 	u32 result_count;
 	u32 status;
+	u32 datalen;
 
 	brcmf_dbg(SCAN, "Enter\n");
 
@@ -3326,6 +3327,14 @@ brcmf_notify_sched_scan_results(struct brcmf_if *ifp,
 		brcmf_err("FALSE PNO Event. (pfn_count == 0)\n");
 		goto out_err;
 	}
+
+	netinfo_start = brcmf_get_netinfo_array(pfn_result);
+	datalen = e->datalen - ((void *)netinfo_start - (void *)pfn_result);
+	if (datalen < result_count * sizeof(*netinfo)) {
+		brcmf_err("insufficient event data\n");
+		goto out_err;
+	}
+
 	request = brcmf_alloc_internal_escan_request(wiphy,
 						     result_count);
 	if (!request) {
@@ -3333,8 +3342,6 @@ brcmf_notify_sched_scan_results(struct brcmf_if *ifp,
 		goto out_err;
 	}
 
-	netinfo_start = brcmf_get_netinfo_array(pfn_result);
-
 	for (i = 0; i < result_count; i++) {
 		netinfo = &netinfo_start[i];
 		if (!netinfo) {
@@ -3344,6 +3351,8 @@ brcmf_notify_sched_scan_results(struct brcmf_if *ifp,
 			goto out_err;
 		}
 
+		if (netinfo->SSID_len > IEEE80211_MAX_SSID_LEN)
+			netinfo->SSID_len = IEEE80211_MAX_SSID_LEN;
 		brcmf_dbg(SCAN, "SSID:%.32s Channel:%d\n",
 			  netinfo->SSID, netinfo->channel);
 		err = brcmf_internal_escan_add_info(request,