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xfrm: Fix NULL pointer dereference on policy lookup
[ Upstream commit b1e3a5607034aa0a481c6f69a6893049406665fb ]
When xfrm interfaces are used in combination with namespaces
and ESP offload, we get a dst_entry NULL pointer dereference.
This is because we don't have a dst_entry attached in the ESP
offloading case and we need to do a policy lookup before the
namespace transition.
Fix this by expicit checking of skb_dst(skb) before accessing it.
Fixes: f203b76d78
("xfrm: Add virtual xfrm interfaces")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -1098,7 +1098,7 @@ static inline int __xfrm_policy_check2(struct sock *sk, int dir,
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return __xfrm_policy_check(sk, ndir, skb, family);
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return (!net->xfrm.policy_count[dir] && !secpath_exists(skb)) ||
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(skb_dst(skb)->flags & DST_NOPOLICY) ||
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(skb_dst(skb) && (skb_dst(skb)->flags & DST_NOPOLICY)) ||
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__xfrm_policy_check(sk, ndir, skb, family);
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}
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