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 C5231EE49A5 for ; Mon, 21 Aug 2023 20:05:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230229AbjHUUF1 (ORCPT ); Mon, 21 Aug 2023 16:05:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230232AbjHUUF0 (ORCPT ); Mon, 21 Aug 2023 16:05:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCADB11C for ; Mon, 21 Aug 2023 13:05:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5F0346191C for ; Mon, 21 Aug 2023 20:05:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6EF30C433C8; Mon, 21 Aug 2023 20:05:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1692648323; bh=UoIPqozLxwklBSS3rgN2pzmq8qRddHYrb7TTDl3zKwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pxE15+Kc9N+xgYqe1wNnES7v8L9/4ihnRryaTsM8WbgcTGQAuVc+sejaeEPGwy8AM PbysujzJB+FOrQbp7RcZ/A7f8V62wwcurKA/i8/HlDf4abjLKdiGRzcoZ5brOfp4UA Tfsbcm68DQJRtzhzm0410B8P4Qm/GNCFaFLrNQ/4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Maciej=20=C5=BBenczykowski?= , Herbert Xu , Steffen Klassert , Sasha Levin Subject: [PATCH 6.4 135/234] xfrm: Silence warnings triggerable by bad packets Date: Mon, 21 Aug 2023 21:41:38 +0200 Message-ID: <20230821194134.798873838@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230821194128.754601642@linuxfoundation.org> References: <20230821194128.754601642@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Herbert Xu [ Upstream commit 57010b8ece2821a1fdfdba2197d14a022f3769db ] After the elimination of inner modes, a couple of warnings that were previously unreachable can now be triggered by malformed inbound packets. Fix this by: 1. Moving the setting of skb->protocol into the decap functions. 2. Returning -EINVAL when unexpected protocol is seen. Reported-by: Maciej Żenczykowski Fixes: 5f24f41e8ea6 ("xfrm: Remove inner/outer modes from input path") Signed-off-by: Herbert Xu Reviewed-by: Maciej Żenczykowski Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin --- net/xfrm/xfrm_input.c | 22 +++++++++------------- 1 file changed, 9 insertions(+), 13 deletions(-) diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index 815b380804011..d5ee96789d4bf 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -180,6 +180,8 @@ static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) int optlen = 0; int err = -EINVAL; + skb->protocol = htons(ETH_P_IP); + if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { struct ip_beet_phdr *ph; int phlen; @@ -232,6 +234,8 @@ static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) { int err = -EINVAL; + skb->protocol = htons(ETH_P_IP); + if (!pskb_may_pull(skb, sizeof(struct iphdr))) goto out; @@ -267,6 +271,8 @@ static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) { int err = -EINVAL; + skb->protocol = htons(ETH_P_IPV6); + if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto out; @@ -296,6 +302,8 @@ static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) int size = sizeof(struct ipv6hdr); int err; + skb->protocol = htons(ETH_P_IPV6); + err = skb_cow_head(skb, size + skb->mac_len); if (err) goto out; @@ -346,6 +354,7 @@ xfrm_inner_mode_encap_remove(struct xfrm_state *x, return xfrm6_remove_tunnel_encap(x, skb); break; } + return -EINVAL; } WARN_ON_ONCE(1); @@ -366,19 +375,6 @@ static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) return -EAFNOSUPPORT; } - switch (XFRM_MODE_SKB_CB(skb)->protocol) { - case IPPROTO_IPIP: - case IPPROTO_BEETPH: - skb->protocol = htons(ETH_P_IP); - break; - case IPPROTO_IPV6: - skb->protocol = htons(ETH_P_IPV6); - break; - default: - WARN_ON_ONCE(1); - break; - } - return xfrm_inner_mode_encap_remove(x, skb); } -- 2.40.1