From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C9B303E5ECF; Wed, 20 May 2026 17:50:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779299430; cv=none; b=WKASn3PwrtaJdocdaCNaWwnItHAOvTHMT725GqD+xznrWDT5XmGbwKbWozt7/aUyb/YHDfgpn5jwiOBJzoN+nnFZuuoKz29/cglmg7A+/vV8reCoahKdZOzrRYUUUNYjBsbsOBHako2UrbDOOPEdM3tFoY5f6DKMpKulYcYwmWA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779299430; c=relaxed/simple; bh=DWgYu8BebPO9EXER8CoSFP6sYIWoS9PsyYKWiz6vHEE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lJUnMWwG/cD6UGPMOeK3H+xfniwyoBEC/jY61GXaqh3ezih9bgFeRMa9yj72RbH6iQBd3wR56wvx3aGgss/gAlqVWD3eQNz/pVrrkW28/W/Iio3vAseegaUccV/si19o3guo2NMq7YRgp1j+5v6iQqFAqBzyGMYKqY/0hd2q1h0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Oip7pu6o; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Oip7pu6o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03A081F00893; Wed, 20 May 2026 17:50:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779299429; bh=bJ3I2ACWAz/Uebfd4JC90ezFLJWiujluFfX2HuqxyhU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Oip7pu6ohuGW2Ba+WWVr4jJBiZH0o2G+WsElAJckqmzp2zxe2rkl8lyh9DciybxN/ N9S3vGcKW6j8JXx1UKvs7Okj0LjjYI8eD13TME8+3kX/K7bfXNXxWf6kM2evX+HmSF /tnVrjUg0c8kCdasC7dsupXe18HBuz4CCld3bu7Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuan Tan , Yifan Wu , Juefei Pu , Xin Liu , Jiexun Wang , Ren Wei , Florian Westphal , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 6.18 752/957] netfilter: xt_policy: fix strict mode inbound policy matching Date: Wed, 20 May 2026 18:20:35 +0200 Message-ID: <20260520162150.872954677@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162134.554764788@linuxfoundation.org> References: <20260520162134.554764788@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiexun Wang [ Upstream commit 4b2b4d7d4e203c92db8966b163edfacb1f0e1e29 ] match_policy_in() walks sec_path entries from the last transform to the first one, but strict policy matching needs to consume info->pol[] in the same forward order as the rule layout. Derive the strict-match policy position from the number of transforms already consumed so that multi-element inbound rules are matched consistently. Fixes: c4b885139203 ("[NETFILTER]: x_tables: replace IPv4/IPv6 policy match by address family independant version") Reported-by: Yuan Tan Reported-by: Yifan Wu Reported-by: Juefei Pu Reported-by: Xin Liu Signed-off-by: Jiexun Wang Signed-off-by: Ren Wei Acked-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/xt_policy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/xt_policy.c b/net/netfilter/xt_policy.c index cb6e8279010a4..b5fa65558318f 100644 --- a/net/netfilter/xt_policy.c +++ b/net/netfilter/xt_policy.c @@ -63,7 +63,7 @@ match_policy_in(const struct sk_buff *skb, const struct xt_policy_info *info, return 0; for (i = sp->len - 1; i >= 0; i--) { - pos = strict ? i - sp->len + 1 : 0; + pos = strict ? sp->len - i - 1 : 0; if (pos >= info->len) return 0; e = &info->pol[pos]; -- 2.53.0