From d9b7ad9d124b0d3154bf0fe64ca5425827de498b Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Wed, 16 Dec 2009 05:12:58 +0100 Subject: Libertas: fix buffer overflow in lbs_get_essid() 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(-) (limited to 'drivers') diff --git a/drivers/net/wireless/libertas/wext.c b/drivers/net/wireless/libertas/wext.c index 8b3ed77860b..d9fca298369 100644 --- 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_device *dev, struct iw_request_info *info, 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 -- cgit v1.2.3-18-g5258