linux-kernel - [PATCH 3.16 192/202] brcmfmac: assure SSID length from firmware is limited

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Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Pieter-Paul Giesberts" <pieter-paul.giesberts@...adcom.com>,
        "Hante Meuleman" <hante.meuleman@...adcom.com>,
        "Franky Lin" <franky.lin@...adcom.com>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Arend van Spriel" <arend.vanspriel@...adcom.com>
Subject: [PATCH 3.16 192/202] brcmfmac: assure SSID length from firmware
 is limited

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arend van Spriel <arend.vanspriel@...adcom.com>

commit 1b5e2423164b3670e8bc9174e4762d297990deff upstream.

The SSID length as received from firmware should not exceed
IEEE80211_MAX_SSID_LEN as that would result in heap overflow.

Reviewed-by: Hante Meuleman <hante.meuleman@...adcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>
Reviewed-by: Franky Lin <franky.lin@...adcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@...adcom.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
@@ -3082,6 +3082,8 @@ brcmf_notify_sched_scan_results(struct b
 
 			brcmf_dbg(SCAN, "SSID:%s Channel:%d\n",
 				  netinfo->SSID, netinfo->channel);
+			if (netinfo->SSID_len > IEEE80211_MAX_SSID_LEN)
+				netinfo->SSID_len = IEEE80211_MAX_SSID_LEN;
 			memcpy(ssid[i].ssid, netinfo->SSID, netinfo->SSID_len);
 			ssid[i].ssid_len = netinfo->SSID_len;
 			request->n_ssids++;