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ipv6: fix panic when forwarding a pkt with no in6 dev

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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: [email protected]
Fixes: ccd27f05ae ("ipv6: fix 'disable_policy' for fwd packets")
Reported-by: kongweibin <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Reviewed-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Nicolas Dichtel
2022-04-11 12:28:43 +01:00
committed by David S. Miller
parent 1a7eb80d17
commit e3fa461d8b
1 changed files with 1 additions and 1 deletions
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net/ipv6/ip6_output.c
+1 -1
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@@ -485,7 +485,7 @@ 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;