linux-kernel - [ 28/82] mac80211: fix SSID copy on IBSS JOIN

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Message-Id: <20121114053937.769633291@decadent.org.uk>
Date:	Wed, 14 Nov 2012 05:40:01 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Antonio Quartulli <ordex@...istici.org>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [ 28/82] mac80211: fix SSID copy on IBSS JOIN

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Antonio Quartulli <ordex@...istici.org>

commit badecb001a310408d3473b1fc2ed5aefd0bc92a9 upstream.

The 'ssid' field of the cfg80211_ibss_params is a u8 pointer and
its length is likely to be less than IEEE80211_MAX_SSID_LEN most
of the time.

This patch fixes the ssid copy in ieee80211_ibss_join() by using
the SSID length to prevent it from reading beyond the string.

Signed-off-by: Antonio Quartulli <ordex@...istici.org>
[rewrapped commit message, small rewording]
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/ibss.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 5f3620f..bf87c70 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -1108,7 +1108,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 	sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
 	sdata->u.ibss.ibss_join_req = jiffies;
 
-	memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
+	memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
 	sdata->u.ibss.ssid_len = params->ssid_len;
 
 	mutex_unlock(&sdata->u.ibss.mtx);


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