From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756537Ab2KNFxk (ORCPT ); Wed, 14 Nov 2012 00:53:40 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:55295 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756426Ab2KNFvL (ORCPT ); Wed, 14 Nov 2012 00:51:11 -0500 Message-Id: <20121114053937.769633291@decadent.org.uk> User-Agent: quilt/0.60-1 Date: Wed, 14 Nov 2012 05:40:01 +0000 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Antonio Quartulli , Johannes Berg Subject: [ 28/82] mac80211: fix SSID copy on IBSS JOIN In-Reply-To: <20121114053933.726869752@decadent.org.uk> X-SA-Exim-Connect-IP: 2001:470:1f08:1539:21c:bfff:fe03:f805 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Antonio Quartulli 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 [rewrapped commit message, small rewording] Signed-off-by: Johannes Berg Signed-off-by: Ben Hutchings --- 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);