linux-kernel - [PATCH 4.9 09/44] ipv4: recompile ip options in ipv4_link

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Message-Id: <20190424170846.309239766@linuxfoundation.org>
Date:   Wed, 24 Apr 2019 19:09:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stephen Suryaputra <ssuryaextr@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 09/44] ipv4: recompile ip options in ipv4_link_failure

From: Stephen Suryaputra <ssuryaextr@...il.com>

[ Upstream commit ed0de45a1008991fdaa27a0152befcb74d126a8b ]

Recompile IP options since IPCB may not be valid anymore when
ipv4_link_failure is called from arp_error_report.

Refer to the commit 3da1ed7ac398 ("net: avoid use IPCB in cipso_v4_error")
and the commit before that (9ef6b42ad6fd) for a similar issue.

Signed-off-by: Stephen Suryaputra <ssuryaextr@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/route.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1171,8 +1171,16 @@ static struct dst_entry *ipv4_dst_check(
 static void ipv4_link_failure(struct sk_buff *skb)
 {
 	struct rtable *rt;
+	struct ip_options opt;
 
-	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
+	/* Recompile ip options since IPCB may not be valid anymore.
+	 */
+	memset(&opt, 0, sizeof(opt));
+	opt.optlen = ip_hdr(skb)->ihl*4 - sizeof(struct iphdr);
+	if (__ip_options_compile(dev_net(skb->dev), &opt, skb, NULL))
+		return;
+
+	__icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt);
 
 	rt = skb_rtable(skb);
 	if (rt)