From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:56676 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752485AbeERISF (ORCPT ); Fri, 18 May 2018 04:18:05 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , syzbot , Jakub Sitnicki , "David S. Miller" Subject: [PATCH 4.16 37/55] ipv6: fix uninit-value in ip6_multipath_l3_keys() Date: Fri, 18 May 2018 10:15:33 +0200 Message-Id: <20180518081459.207775479@linuxfoundation.org> In-Reply-To: <20180518081457.428920292@linuxfoundation.org> References: <20180518081457.428920292@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit cea67a2dd6b2419dcc13a39309b9a79a1f773193 ] syzbot/KMSAN reported an uninit-value in ip6_multipath_l3_keys(), root caused to a bad assumption of ICMP header being already pulled in skb->head ip_multipath_l3_keys() does the correct thing, so it is an IPv6 only bug. BUG: KMSAN: uninit-value in ip6_multipath_l3_keys net/ipv6/route.c:1830 [inline] BUG: KMSAN: uninit-value in rt6_multipath_hash+0x5c4/0x640 net/ipv6/route.c:1858 CPU: 0 PID: 4507 Comm: syz-executor661 Not tainted 4.16.0+ #87 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 ip6_multipath_l3_keys net/ipv6/route.c:1830 [inline] rt6_multipath_hash+0x5c4/0x640 net/ipv6/route.c:1858 ip6_route_input+0x65a/0x920 net/ipv6/route.c:1884 ip6_rcv_finish+0x413/0x6e0 net/ipv6/ip6_input.c:69 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0x1e16/0x2340 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4562 __netif_receive_skb net/core/dev.c:4627 [inline] netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701 netif_receive_skb+0x230/0x240 net/core/dev.c:4725 tun_rx_batched drivers/net/tun.c:1555 [inline] tun_get_user+0x740f/0x7c60 drivers/net/tun.c:1962 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x7fb/0x9f0 fs/read_write.c:482 vfs_write+0x463/0x8d0 fs/read_write.c:544 SYSC_write+0x172/0x360 fs/read_write.c:589 SyS_write+0x55/0x80 fs/read_write.c:581 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Fixes: 23aebdacb05d ("ipv6: Compute multipath hash for ICMP errors from offending packet") Signed-off-by: Eric Dumazet Reported-by: syzbot Cc: Jakub Sitnicki Acked-by: Jakub Sitnicki Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/route.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1822,11 +1822,16 @@ static void ip6_multipath_l3_keys(const const struct ipv6hdr *inner_iph; const struct icmp6hdr *icmph; struct ipv6hdr _inner_iph; + struct icmp6hdr _icmph; if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) goto out; - icmph = icmp6_hdr(skb); + icmph = skb_header_pointer(skb, skb_transport_offset(skb), + sizeof(_icmph), &_icmph); + if (!icmph) + goto out; + if (icmph->icmp6_type != ICMPV6_DEST_UNREACH && icmph->icmp6_type != ICMPV6_PKT_TOOBIG && icmph->icmp6_type != ICMPV6_TIME_EXCEED &&