From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 246E8C43334 for ; Mon, 13 Jun 2022 10:32:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243788AbiFMKcJ (ORCPT ); Mon, 13 Jun 2022 06:32:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237301AbiFMK1r (ORCPT ); Mon, 13 Jun 2022 06:27:47 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C340F2496A; Mon, 13 Jun 2022 03:20:03 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 607BECE1102; Mon, 13 Jun 2022 10:20:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23FBBC3411C; Mon, 13 Jun 2022 10:19:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655115599; bh=f6lkio02YA4MucitoAR7FMKAAP4DjyL3eEki7YPIxC0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HayCzJsy9reGlF0S8qTQFSTg1ZjEYsLXGLstII6HC1HAB8RVCb7G2rGBebc/xf4o6 BbV14hpoX7EkAox9iE8avmCXI5aHftZ/eyplRDnt1xWrc0wD5q1DwJ+AeFTyT37j4R O3YlGgg9v/cBJkLe79+RiJXqx4RzmC6dye0J9nBw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nucca Chen , Cong Wang , David Ahern , "David S. Miller" , Jakub Kicinski , Jamal Hadi Salim , Jiri Pirko , Jiri Pirko , Sasha Levin Subject: [PATCH 4.9 132/167] net: fix nla_strcmp to handle more then one trailing null character Date: Mon, 13 Jun 2022 12:10:06 +0200 Message-Id: <20220613094911.831273074@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094840.720778945@linuxfoundation.org> References: <20220613094840.720778945@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Maciej Żenczykowski [ Upstream commit 2c16db6c92b0ee4aa61e88366df82169e83c3f7e ] Android userspace has been using TCA_KIND with a char[IFNAMESIZ] many-null-terminated buffer containing the string 'bpf'. This works on 4.19 and ceases to work on 5.10. I'm not entirely sure what fixes tag to use, but I think the issue was likely introduced in the below mentioned 5.4 commit. Reported-by: Nucca Chen Cc: Cong Wang Cc: David Ahern Cc: David S. Miller Cc: Jakub Kicinski Cc: Jamal Hadi Salim Cc: Jiri Pirko Cc: Jiri Pirko Fixes: 62794fc4fbf5 ("net_sched: add max len check for TCA_KIND") Change-Id: I66dc281f165a2858fc29a44869a270a2d698a82b Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- lib/nlattr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/nlattr.c b/lib/nlattr.c index fce1e9afc6d9..ea27e1d069b1 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -316,7 +316,7 @@ int nla_strcmp(const struct nlattr *nla, const char *str) int attrlen = nla_len(nla); int d; - if (attrlen > 0 && buf[attrlen - 1] == '\0') + while (attrlen > 0 && buf[attrlen - 1] == '\0') attrlen--; d = attrlen - len; -- 2.35.1