Patch "mwifiex: printk() overflow with 32-byte SSIDs" has been added to the 4.4-stable tree

Patch "mwifiex: printk() overflow with 32-byte SSIDs" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mwifiex: printk() overflow with 32-byte SSIDs

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mwifiex-printk-overflow-with-32-byte-ssids.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fcd2042e8d36cf644bd2d69c26378d17158b17df Mon Sep 17 00:00:00 2001
From: Brian Norris <briannorris@chromium.org>
Date: Tue, 8 Nov 2016 18:28:24 -0800
Subject: mwifiex: printk() overflow with 32-byte SSIDs

From: Brian Norris <briannorris@chromium.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@chromium.org>
Acked-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -2144,8 +2144,9 @@ done:
 			is_scanning_required = 1;
 		} else {
 			mwifiex_dbg(priv->adapter, MSG,
-				    "info: trying to associate to '%s' bssid %pM\n",
-				    (char *)req_ssid.ssid, bss->bssid);
+				    "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;
 		}
@@ -2202,8 +2203,8 @@ mwifiex_cfg80211_connect(struct wiphy *w
 	}
 
 	mwifiex_dbg(adapter, INFO,
-		    "info: Trying to associate to %s and bssid %pM\n",
-		    (char *)sme->ssid, sme->bssid);
+		    "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);
@@ -2333,8 +2334,8 @@ mwifiex_cfg80211_join_ibss(struct wiphy
 	}
 
 	mwifiex_dbg(priv->adapter, MSG,
-		    "info: trying to join to %s and bssid %pM\n",
-		    (char *)params->ssid, params->bssid);
+		    "info: trying to join to %.*s and bssid %pM\n",
+		    params->ssid_len, (char *)params->ssid, params->bssid);
 
 	mwifiex_set_ibss_params(priv, params);
 


Patches currently in stable-queue which might be from briannorris@chromium.org are

queue-4.4/mwifiex-printk-overflow-with-32-byte-ssids.patch