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 522B339768C; Tue, 21 Jul 2026 22:19:01 +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=1784672342; cv=none; b=XhhIwBzdoVZG35Og8/UHiVUbZFUcHwPDs30sB5FFBwtb3KuCfBgNGlHOoY4jeMb6Ql4I03NIGOnazlJyl61B6wV28ZYjQlo/5EXB//45n6dZY/RregJv1pbvTbM63hpMoY3yYc5B5JPqCu7f2Jw5HyjWvK7umBGC/u9CR6CS6FA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672342; c=relaxed/simple; bh=eChGDw0NfRK+VtxxAAiMF/LzS2wVQsz5pRfTWS2IKVs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=g52MigZkvJnlA/BOwEwH+wNB3bZb/FNkXEW7DxZZCnSqb158xutAxHcbaO9E7IFhVR2NJBDW2qA9sm0D6KeQEaQvyGKUEGAFAx3g4deVI6nqsMuIVqwpXWs7DV7fGGsmLN1lR42wkBlodQ66XEklyikFCJbR+NhnW5iCKuMuotU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1vEdflL/; 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="1vEdflL/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA9BE1F000E9; Tue, 21 Jul 2026 22:19:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672341; bh=iyqH7jz/22JynZWU93g2zTs6e5Jy3GwjcC8nk3dZzUc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=1vEdflL/ZC6CtIicXUFv482JHdZimLN0vncvnMZgFfyWBZMeNh1wvfUZltaiT3c0/ R+p7XfxrH3VatvqkyxBIAAD6nHqS0vayKh4EFQ0UxmlZnZCbLvu23PSBaKXASpBQk5 DsOyqGjGT5zLk4LVXZIAKEr6DZnOuY0KC7WaTyA8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yizhou Zhao , Yuxiang Yang , Ao Wang , Xuewei Feng , Qi Li , Ke Xu , Julian Anastasov , Florian Westphal , Sasha Levin Subject: [PATCH 5.15 545/843] ipvs: use parsed transport offset in TCP state lookup Date: Tue, 21 Jul 2026 17:23:00 +0200 Message-ID: <20260721152418.298153694@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yizhou Zhao [ Upstream commit 2500fa3958b1ba51c2b065e39db1b04dfa7e23a2 ] TCP state handling reparses the skb to find the TCP header. For IPv6 it uses sizeof(struct ipv6hdr), while the surrounding IPVS code already parsed the packet with ip_vs_fill_iph_skb() and has the real transport-header offset in iph.len. This makes TCP state handling look at the wrong bytes when an IPv6 packet carries extension headers. Use the parsed transport offset passed down from ip_vs_set_state() when reading the TCP header. For IPv4 and for IPv6 packets without extension headers, the passed offset matches the previous value. Fixes: 0bbdd42b7efa6 ("IPVS: Extend protocol DNAT/SNAT and state handlers") Link: https://lore.kernel.org/netdev/20260705125659.37744-1-zhaoyz24@mails.tsinghua.edu.cn/ Reported-by: Yizhou Zhao Reported-by: Yuxiang Yang Reported-by: Ao Wang Reported-by: Xuewei Feng Reported-by: Qi Li Reported-by: Ke Xu Assisted-by: Claude Code:GLM-5.2 Signed-off-by: Yizhou Zhao Acked-by: Julian Anastasov Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin --- net/netfilter/ipvs/ip_vs_proto_tcp.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c index dc8394383c148e..b382810156b2c6 100644 --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c @@ -585,13 +585,7 @@ tcp_state_transition(struct ip_vs_conn *cp, int direction, { struct tcphdr _tcph, *th; -#ifdef CONFIG_IP_VS_IPV6 - int ihl = cp->af == AF_INET ? ip_hdrlen(skb) : sizeof(struct ipv6hdr); -#else - int ihl = ip_hdrlen(skb); -#endif - - th = skb_header_pointer(skb, ihl, sizeof(_tcph), &_tcph); + th = skb_header_pointer(skb, iph_len, sizeof(_tcph), &_tcph); if (th == NULL) return; -- 2.53.0