From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
commit e3fa461d8b0e185b7da8a101fe94dfe6dd500ac0 upstream.
kongweibin reported a kernel panic in ip6_forward() when input interface
has no in6 dev associated.
The following tc commands were used to reproduce this panic:
tc qdisc del dev vxlan100 root
tc qdisc add dev vxlan100 root netem corrupt 5%
CC: stable@xxxxxxxxxxxxxxx
Fixes: ccd27f05ae7b ("ipv6: fix 'disable_policy' for fwd packets")
Reported-by: kongweibin <kongweibin2@xxxxxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/ip6_output.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -508,7 +508,7 @@ int ip6_forward(struct sk_buff *skb)
goto drop;
if (!net->ipv6.devconf_all->disable_policy &&
- !idev->cnf.disable_policy &&
+ (!idev || !idev->cnf.disable_policy) &&
!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
goto drop;
