linux-kernel - [PATCH 4.9 50/83] brcmfmac: assure SSID length from firmware is limited

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Message-Id: <20190609164132.220496606@linuxfoundation.org>
Date:   Sun,  9 Jun 2019 18:42:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 4.9 50/83] brcmfmac: assure SSID length from firmware is limited

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 4.9: adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -3579,6 +3579,8 @@ brcmf_wowl_nd_results(struct brcmf_if *i
 
 	data += sizeof(struct brcmf_pno_scanresults_le);
 	netinfo = (struct brcmf_pno_net_info_le *)data;
+	if (netinfo->SSID_len > IEEE80211_MAX_SSID_LEN)
+		netinfo->SSID_len = IEEE80211_MAX_SSID_LEN;
 	memcpy(cfg->wowl.nd->ssid.ssid, netinfo->SSID, netinfo->SSID_len);
 	cfg->wowl.nd->ssid.ssid_len = netinfo->SSID_len;
 	cfg->wowl.nd->n_channels = 1;