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 <ssuryae...@gmail.com>
---
net/ipv4/route.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a5da63e5faa2..0206789bc2b7 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1186,8 +1186,16 @@ static struct dst_entry *ipv4_dst_check(struct dst_entry
*dst, u32 cookie)
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)
--
2.17.1
