From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933597Ab3AIUj2 (ORCPT ); Wed, 9 Jan 2013 15:39:28 -0500 Received: from mail.kernel.org ([198.145.19.201]:42712 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933314Ab3AIUjZ (ORCPT ); Wed, 9 Jan 2013 15:39:25 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Xi Wang , Trond Myklebust Subject: [ 052/123] nfs: fix null checking in nfs_get_option_str() Date: Wed, 9 Jan 2013 12:34:51 -0800 Message-Id: <20130109201505.225886203@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130109201458.392601412@linuxfoundation.org> References: <20130109201458.392601412@linuxfoundation.org> User-Agent: quilt/0.60-2.1.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xi Wang commit e25fbe380c4e3c09afa98bcdcd9d3921443adab8 upstream. The following null pointer check is broken. *option = match_strdup(args); return !option; The pointer `option' must be non-null, and thus `!option' is always false. Use `!*option' instead. The bug was introduced in commit c5cb09b6f8 ("Cleanup: Factor out some cut-and-paste code."). Signed-off-by: Xi Wang Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1150,7 +1150,7 @@ static int nfs_get_option_str(substring_ { kfree(*option); *option = match_strdup(args); - return !option; + return !*option; } static int nfs_get_option_ul(substring_t args[], unsigned long *option)