Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755291Ab0AETwy (ORCPT ); Tue, 5 Jan 2010 14:52:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754644Ab0AETwx (ORCPT ); Tue, 5 Jan 2010 14:52:53 -0500 Received: from kroah.org ([198.145.64.141]:46002 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754505Ab0AETww (ORCPT ); Tue, 5 Jan 2010 14:52:52 -0500 X-Mailbox-Line: From gregkh@mini.kroah.org Tue Jan 5 11:49:14 2010 Message-Id: <20100105194914.321801567@mini.kroah.org> User-Agent: quilt/0.48-1 Date: Tue, 05 Jan 2010 11:47:52 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org, akpm@linux-foundation.org, torvalds@linux-foundation.org, stable-review@kernel.org Cc: Daniel Mack , Stephen Hemminger , Maithili Hinge , Kiran Divekar , Michael Hirsch , netdev@vger.kernel.org, libertas-dev@lists.infradead.org, linux-wireless@lists.infradead.org, Holger Schurig , Dan Williams , "John W. Linville" Subject: [01/10] Libertas: fix buffer overflow in lbs_get_essid() In-Reply-To: <20100105195007.GA23952@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1927 Lines: 56 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Daniel Mack commit 45b241689179a6065384260242637cf21dabfb2d upstream. The libertas driver copies the SSID buffer back to the wireless core and appends a trailing NULL character for termination. This is a) unnecessary because the buffer is allocated with kzalloc and is hence already NULLed when this function is called, and b) for priv->curbssparams.ssid_len == 32, it writes back one byte too much which causes memory corruptions. Fix this by removing the extra write. Signed-off-by: Daniel Mack Cc: Stephen Hemminger Cc: Maithili Hinge Cc: Kiran Divekar Cc: Michael Hirsch Cc: netdev@vger.kernel.org Cc: libertas-dev@lists.infradead.org Cc: linux-wireless@lists.infradead.org Acked-by: Holger Schurig Acked-by: Dan Williams Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/libertas/wext.c | 2 -- 1 file changed, 2 deletions(-) --- a/drivers/net/wireless/libertas/wext.c +++ b/drivers/net/wireless/libertas/wext.c @@ -1899,10 +1899,8 @@ static int lbs_get_essid(struct net_devi if (priv->connect_status == LBS_CONNECTED) { memcpy(extra, priv->curbssparams.ssid, priv->curbssparams.ssid_len); - extra[priv->curbssparams.ssid_len] = '\0'; } else { memset(extra, 0, 32); - extra[priv->curbssparams.ssid_len] = '\0'; } /* * If none, we may want to get the one that was set -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/