From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 976DE2EAB82; Fri, 15 May 2026 16:03:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778861009; cv=none; b=gd0yteDUh9lyQiW/RHacBk31fhNCILuqRR7niYX1Te48xBSgYcoTOTBci5r4uc2sBpCmJot0GthQaFHTzPiczRf+TktX9YYgwk231C7UsP3ndvPfN+rc1qDecrO5nm6ezARVZ1eA++GOlrMFVyYjkZF6ONoNb4W0fuXG33SulGE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778861009; c=relaxed/simple; bh=tKcL84HENbE8rivM7MoORaJDf0kh7dd1wP2jNAEG5KM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t0Lg43ze8QdZO0nw+UW4yQJ7zG5xkFAcfiMU2hgGisOTUiNkK+4LzjGOa3za899lX31pgWKyU6phTDXGzFTYBlo2fulN7GXiZuYnyhRn0r2c/7wol5/Ru7ST/AVVuv8hQiZedpclrIBoGa5tvW9u1YuwiTeFGz2Oszd7S4j8aac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oaAezCRh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oaAezCRh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D4EFC2BCB3; Fri, 15 May 2026 16:03:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778861009; bh=tKcL84HENbE8rivM7MoORaJDf0kh7dd1wP2jNAEG5KM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oaAezCRhFM3WpGqjMepPG7NwQ4s/TkeNvkrPL/iga26sifsSADeoVzjpNP912q2m2 UbptwQ0eC4fYbHd9MmE6iGyppisiUdoo0XM9rSCMVtfUcRGB6n3VWarx08S9xes9qk 0E8REg5ui9E/5iGMtj4x8+15DLiokhiZHPW9hkdQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dong Chenchen , David Ahern , Eric Dumazet , Jakub Kicinski , Jiayuan Chen , Sasha Levin Subject: [PATCH 6.6 165/474] net: Fix icmp host relookup triggering ip_rt_bug Date: Fri, 15 May 2026 17:44:34 +0200 Message-ID: <20260515154718.594402653@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260515154715.053014143@linuxfoundation.org> References: <20260515154715.053014143@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dong Chenchen [ Upstream commit c44daa7e3c73229f7ac74985acb8c7fb909c4e0a ] arp link failure may trigger ip_rt_bug while xfrm enabled, call trace is: WARNING: CPU: 0 PID: 0 at net/ipv4/route.c:1241 ip_rt_bug+0x14/0x20 Modules linked in: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc6-00077-g2e1b3cc9d7f7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:ip_rt_bug+0x14/0x20 Call Trace: ip_send_skb+0x14/0x40 __icmp_send+0x42d/0x6a0 ipv4_link_failure+0xe2/0x1d0 arp_error_report+0x3c/0x50 neigh_invalidate+0x8d/0x100 neigh_timer_handler+0x2e1/0x330 call_timer_fn+0x21/0x120 __run_timer_base.part.0+0x1c9/0x270 run_timer_softirq+0x4c/0x80 handle_softirqs+0xac/0x280 irq_exit_rcu+0x62/0x80 sysvec_apic_timer_interrupt+0x77/0x90 The script below reproduces this scenario: ip xfrm policy add src 0.0.0.0/0 dst 0.0.0.0/0 \ dir out priority 0 ptype main flag localok icmp ip l a veth1 type veth ip a a 192.168.141.111/24 dev veth0 ip l s veth0 up ping 192.168.141.155 -c 1 icmp_route_lookup() create input routes for locally generated packets while xfrm relookup ICMP traffic.Then it will set input route (dst->out = ip_rt_bug) to skb for DESTUNREACH. For ICMP err triggered by locally generated packets, dst->dev of output route is loopback. Generally, xfrm relookup verification is not required on loopback interfaces (net.ipv4.conf.lo.disable_xfrm = 1). Skip icmp relookup for locally generated packets to fix it. Fixes: 8b7817f3a959 ("[IPSEC]: Add ICMP host relookup support") Signed-off-by: Dong Chenchen Reviewed-by: David Ahern Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20241127040850.1513135-1-dongchenchen2@huawei.com Signed-off-by: Jakub Kicinski Signed-off-by: Jiayuan Chen Signed-off-by: Sasha Levin --- net/ipv4/icmp.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 29c73b05b1e1a..3fcf11f83d87b 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -518,6 +518,9 @@ static struct rtable *icmp_route_lookup(struct net *net, struct flowi4 *fl4, if (!IS_ERR(rt)) { if (rt != rt2) return rt; + if (inet_addr_type_dev_table(net, route_lookup_dev, + fl4->daddr) == RTN_LOCAL) + return rt; } else if (PTR_ERR(rt) == -EPERM) { rt = NULL; } else -- 2.53.0