From: Stephen Suryaputra ssuryaextr@gmail.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@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/route.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
--- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1195,8 +1195,16 @@ 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)