linux-kernel - [08/39] Libertas: fix buffer overflow in lbs_get

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Date:	Tue, 05 Jan 2010 12:02:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	stable-review@...nel.org
Cc:	Daniel Mack <daniel@...aq.de>,
	Stephen Hemminger <shemminger@...tta.com>,
	Maithili Hinge <maithili@...vell.com>,
	Kiran Divekar <dkiran@...vell.com>,
	Michael Hirsch <m.hirsch@...mfeld.com>, netdev@...r.kernel.org,
	libertas-dev@...ts.infradead.org,
	linux-wireless@...ts.infradead.org,
	Holger Schurig <holgerschurig@...il.com>,
	Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [08/39] Libertas: fix buffer overflow in lbs_get_essid()

2.6.31-stable review patch.  If anyone has any objections, please let us know.

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

From: Daniel Mack <daniel@...aq.de>

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 <daniel@...aq.de>
Cc: Stephen Hemminger <shemminger@...tta.com>
Cc: Maithili Hinge <maithili@...vell.com>
Cc: Kiran Divekar <dkiran@...vell.com>
Cc: Michael Hirsch <m.hirsch@...mfeld.com>
Cc: netdev@...r.kernel.org
Cc: libertas-dev@...ts.infradead.org
Cc: linux-wireless@...ts.infradead.org
Acked-by: Holger Schurig <holgerschurig@...il.com>
Acked-by: Dan Williams <dcbw@...hat.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 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
@@ -1951,10 +1951,8 @@ 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

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