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

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@vger.kernel.org
Fixes: ccd27f05ae7b ("ipv6: fix 'disable_policy' for fwd packets")
Reported-by: kongweibin <kongweibin2@huawei.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolas Dichtel 2022-04-08 16:03:42 +02:00 committed by Greg Kroah-Hartman
parent 377a80ca65
commit ab2f5afb7a
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_output.c
View File

@ -506,7 +506,7 @@ 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;