linux-kernel - [PATCH 3.2 091/126] mwifiex: printk() overflow with 32-byte SSIDs

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Date:   Wed, 15 Feb 2017 22:41:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Amitkumar Karwar" <akarwar@...vell.com>,
        "Kalle Valo" <kvalo@...eaurora.org>,
        "Brian Norris" <briannorris@...omium.org>
Subject: [PATCH 3.2 091/126] mwifiex: printk() overflow with 32-byte SSIDs

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

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

From: Brian Norris <briannorris@...omium.org>

commit fcd2042e8d36cf644bd2d69c26378d17158b17df upstream.

SSIDs aren't guaranteed to be 0-terminated. Let's cap the max length
when we print them out.

This can be easily noticed by connecting to a network with a 32-octet
SSID:

[ 3903.502925] mwifiex_pcie 0000:01:00.0: info: trying to associate to
'0123456789abcdef0123456789abcdef <uninitialized mem>' bssid
xx:xx:xx:xx:xx:xx

Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
Signed-off-by: Brian Norris <briannorris@...omium.org>
Acked-by: Amitkumar Karwar <akarwar@...vell.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/mwifiex/cfg80211.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -944,8 +944,9 @@ done:
 			}
 			is_scanning_required = 1;
 		} else {
-			dev_dbg(priv->adapter->dev, "info: trying to associate to %s and bssid %pM\n",
-					(char *) req_ssid.ssid, bss->bssid);
+			dev_dbg(priv->adapter->dev, "info: trying to associate to '%.*s' bssid %pM\n",
+				req_ssid.ssid_len, (char *)req_ssid.ssid,
+				bss->bssid);
 			memcpy(&priv->cfg_bssid, bss->bssid, ETH_ALEN);
 			break;
 		}
@@ -989,8 +990,8 @@ mwifiex_cfg80211_connect(struct wiphy *w
 
 	priv->assoc_request = -EINPROGRESS;
 
-	wiphy_dbg(wiphy, "info: Trying to associate to %s and bssid %pM\n",
-	       (char *) sme->ssid, sme->bssid);
+	wiphy_dbg(wiphy, "info: Trying to associate to %.*s and bssid %pM\n",
+		  (int)sme->ssid_len, (char *)sme->ssid, sme->bssid);
 
 	ret = mwifiex_cfg80211_assoc(priv, sme->ssid_len, sme->ssid, sme->bssid,
 				     priv->bss_mode, sme->channel, sme, 0);
@@ -1026,8 +1027,8 @@ mwifiex_cfg80211_join_ibss(struct wiphy
 
 	priv->ibss_join_request = -EINPROGRESS;
 
-	wiphy_dbg(wiphy, "info: trying to join to %s and bssid %pM\n",
-	       (char *) params->ssid, params->bssid);
+	wiphy_dbg(wiphy, "info: trying to join to %.*s and bssid %pM\n",
+		  params->ssid_len, (char *)params->ssid, params->bssid);
 
 	ret = mwifiex_cfg80211_assoc(priv, params->ssid_len, params->ssid,
 				params->bssid, priv->bss_mode,