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 628784779BB; Tue, 16 Jun 2026 15:58:13 +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=1781625494; cv=none; b=F5Fac6h7dCwnLpdqpblmG+sH1DKv76GFx6/E7KqiCMJcK3r/KDykIVmchstT9ft6Ke6DzwEkcPBf0F1+FRAoSfM+kcYzmvkLG/Iq1lhd+hzDvmiqt0/0wKsC/qOnWVcupbyDZwlkThM25aMUTa9QIlsaH1b4ZMSd6LKUhanxZlU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781625494; c=relaxed/simple; bh=0wvTsO2FWFJzHBlIaKgnRvTqXdAHugSE/KzXGgHqHIw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=a6Yq9srDwwRz/4ziRweJfG4PgWCSQCp55bCOSwu7v8K2CKz9K1/vzeXFh5jmdgSov1RVPrJ/CgJPsKcTta49kdDgkbxffbOkMjdcL9shKC5QCbPGJzH4nr/elpGZ2u4mH9Rm8+FuwClVEksRJzf0wR/VIYwIHPfhf8tw2LAfIHw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Ris3gpbb; 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="Ris3gpbb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 366951F000E9; Tue, 16 Jun 2026 15:58:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781625493; bh=Jhm5EaWRn/LVY1xdaZgw4dvhumt/GBZXPHQas3zHd+w=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Ris3gpbbNfSIKfm/2DinajMgR4cPKd5mvrJAloYDsNeHTvkSbS9GJc/ozb4/0mzcA 0xJZd+YvpG3dxnuPOPGs75R88btVa3MmIh3Whlcs2wMiHU4SBMefJjRl8Q10dog66S Doz4APWQFDc8RISYd0GYiEg3rgwkhdiVC8GWkgnk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Steffen Klassert , Nicolas Dichtel , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.18 121/325] ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup() Date: Tue, 16 Jun 2026 20:28:37 +0530 Message-ID: <20260616145103.741402944@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145057.827196531@linuxfoundation.org> References: <20260616145057.827196531@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: Eric Dumazet [ Upstream commit a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 ] In vti6_tnl_lookup(), when an exact match for a tunnel fails, the code falls back to searching for wildcard tunnels: - Tunnels matching the packet's local address, with any remote address wildcard remote). - Tunnels matching the packet's remote address, with any local address (wildcard local). However, vti6 stores all these different types of tunnels in the same hash table (ip6n->tnls_r_l) prone to hash collisions. The bug is that the fallback search loops in vti6_tnl_lookup() were missing checks to ensure that the candidate tunnel actually has a wildcard address. Fixes: fbe68ee87522 ("vti6: Add a lookup method for tunnels with wildcard endpoints.") Signed-off-by: Eric Dumazet Cc: Steffen Klassert Reviewed-by: Nicolas Dichtel Link: https://patch.msgid.link/20260608164613.933023-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv6/ip6_vti.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c index d2b74a6f2cf62d..d871cab6938d36 100644 --- a/net/ipv6/ip6_vti.c +++ b/net/ipv6/ip6_vti.c @@ -106,6 +106,7 @@ vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, hash = HASH(&any, local); for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { if (ipv6_addr_equal(local, &t->parms.laddr) && + ipv6_addr_any(&t->parms.raddr) && (t->dev->flags & IFF_UP)) return t; } @@ -113,6 +114,7 @@ vti6_tnl_lookup(struct net *net, const struct in6_addr *remote, hash = HASH(remote, &any); for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) { if (ipv6_addr_equal(remote, &t->parms.raddr) && + ipv6_addr_any(&t->parms.laddr) && (t->dev->flags & IFF_UP)) return t; } -- 2.53.0