Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764542AbXLMHQY (ORCPT ); Thu, 13 Dec 2007 02:16:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762667AbXLMG6Q (ORCPT ); Thu, 13 Dec 2007 01:58:16 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:55622 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762661AbXLMG6O (ORCPT ); Thu, 13 Dec 2007 01:58:14 -0500 Date: Wed, 12 Dec 2007 22:53:23 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org, davem@davemloft.net Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Pablo Neira Ayuso , Patrick McHardy , Herbert Xu Subject: [patch 49/60] TEXTSEARCH: Do not allow zero length patterns in the textsearch infrastructure Message-ID: <20071213065323.GY6867@kroah.com> References: <20071213064518.328162328@mini.kroah.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename="textsearch-do-not-allow-zero-length-patterns-in-the-textsearch-infrastructure.patch" In-Reply-To: <20071213065039.GA6867@kroah.com> User-Agent: Mutt/1.5.16 (2007-06-09) X-Bad-Reply: References and In-Reply-To but no 'Re:' in Subject. Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1971 Lines: 61 2.6.23-stable review patch. If anyone has any objections, please let us know. ------------------ From: Pablo Neira Ayuso [TEXTSEARCH]: Do not allow zero length patterns in the textsearch infrastructure [ Upstream commit: e03ba84adb62fbc6049325a5bc00ef6932fa5e39 ] If a zero length pattern is passed then return EINVAL. Avoids infinite loops (bm) or invalid memory accesses (kmp). Signed-off-by: Pablo Neira Ayuso Signed-off-by: Patrick McHardy Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- lib/textsearch.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/lib/textsearch.c +++ b/lib/textsearch.c @@ -7,7 +7,7 @@ * 2 of the License, or (at your option) any later version. * * Authors: Thomas Graf - * Pablo Neira Ayuso + * Pablo Neira Ayuso * * ========================================================================== * @@ -250,7 +250,8 @@ unsigned int textsearch_find_continuous( * the various search algorithms. * * Returns a new textsearch configuration according to the specified - * parameters or a ERR_PTR(). + * parameters or a ERR_PTR(). If a zero length pattern is passed, this + * function returns EINVAL. */ struct ts_config *textsearch_prepare(const char *algo, const void *pattern, unsigned int len, gfp_t gfp_mask, int flags) @@ -259,6 +260,9 @@ struct ts_config *textsearch_prepare(con struct ts_config *conf; struct ts_ops *ops; + if (len == 0) + return ERR_PTR(-EINVAL); + ops = lookup_ts_algo(algo); #ifdef CONFIG_KMOD /* -- -- 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/