From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.netfilter.org (mail.netfilter.org [217.70.190.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09D46382377; Wed, 25 Mar 2026 22:26:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.190.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774477597; cv=none; b=j6sb7VOBFJdOwuGo4fo/zovVkGKuK0N4g7dItlBvD8iX8lA82Kr5Yl5Bcf32LyJ3fVoqVThD8hP56EEklA5HGx2GR5dvc8zSqrxLr0qqPkXr74Y2fnSzooJzzxB6mwv1VVYqMWijYDyIgAeLNFXwxdirmZThSpUMZ6VW3bJ2/hs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774477597; c=relaxed/simple; bh=3M8SeXoNHLSfSINMUuDheIWOSxvuF8h+a8P9Ia2Rlqc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bcit29FMpfHQg0AcqLizkuwjbPiuNqELD+8hL1EG49n4hI/VFj2ifSqNLjD80tXnX7pbL7UZ1LYIlBgmPytnsSM1K6+BxiWroVQcBkP3R9va15neKij/aOgvB2Fki82CUoLFiCLsRKHRek9151RlGSZXz3ZlNMuuJruUd9bp6w8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org; spf=pass smtp.mailfrom=netfilter.org; dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org header.b=Cz/8Z+jv; arc=none smtp.client-ip=217.70.190.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=netfilter.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org header.b="Cz/8Z+jv" Received: from localhost.localdomain (mail-agni [217.70.190.124]) by mail.netfilter.org (Postfix) with ESMTPSA id 0B2776024E; Wed, 25 Mar 2026 23:26:30 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netfilter.org; s=2025; t=1774477591; bh=GWPRWf1+yS2roJCPasyquMCXNaZuktYHTHQ8GKT903w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cz/8Z+jva0AWCktbXP2sjv9NJDjWKAjA1C5m8RRNzz5gLv0HpjV9F6D2GsxmtcfQA Ui/icT0vEOjRyYB3mtWkPKqVnv2R6UCX6OPe+IHDdg4V4a2WeuFhyFOR5nYBb7utJM bQKWbXTdJd+WBojiKyUSXR6vHTpV1nJlQCAK+Xt82oTQ921ghkiktS+NYNRGFhulow PAfppWfEzM4wv/tC4Ikl4cKxV3Lt6mSjEokD95fz5AtKZ+4qtjQqMi4CWbRXQ+x206 y8u2o5G9xiW9nm+cf541M8hxxKCJdBIv5bZ5lhof/nzEz8XC6y/I3mt4gyjlYDdogd HGKjPE3TqkQZA== From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, fw@strlen.de, horms@kernel.org Subject: [PATCH net 06/14] netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() Date: Wed, 25 Mar 2026 23:26:07 +0100 Message-ID: <20260325222615.637793-7-pablo@netfilter.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260325222615.637793-1-pablo@netfilter.org> References: <20260325222615.637793-1-pablo@netfilter.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ren Wei Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: Yifan Wu Reported-by: Juefei Pu Co-developed-by: Yuan Tan Signed-off-by: Yuan Tan Suggested-by: Xin Liu Tested-by: Yuhang Zheng Signed-off-by: Ren Wei Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/ipv6/netfilter/ip6t_rt.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/ipv6/netfilter/ip6t_rt.c b/net/ipv6/netfilter/ip6t_rt.c index 4ad8b2032f1f..5561bd9cea81 100644 --- a/net/ipv6/netfilter/ip6t_rt.c +++ b/net/ipv6/netfilter/ip6t_rt.c @@ -157,6 +157,10 @@ static int rt_mt6_check(const struct xt_mtchk_param *par) pr_debug("unknown flags %X\n", rtinfo->invflags); return -EINVAL; } + if (rtinfo->addrnr > IP6T_RT_HOPS) { + pr_debug("too many addresses specified\n"); + return -EINVAL; + } if ((rtinfo->flags & (IP6T_RT_RES | IP6T_RT_FST_MASK)) && (!(rtinfo->flags & IP6T_RT_TYP) || (rtinfo->rt_type != 0) || -- 2.47.3