[PATCH 010/241] mac80211: fix SSID copy on IBSS JOIN

From: Herton Ronaldo Krzesinski
Date: Thu Dec 13 2012 - 10:10:43 EST


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

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

From: Antonio Quartulli <ordex@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
[rewrapped commit message, small rewording]
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
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 33d9d0c..ebf6425 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -1111,7 +1111,7 @@ 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);
--
1.7.9.5

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