ipvs: Fix panic due to non-linear skb
Receiving a ICMP response to an IPIP packet in a non-linear skb could cause a kernel panic in __skb_pull. The problem was introduced in commit f2edb9f7 ("ipvs: implement passive PMTUD for IPIP packets"). Signed-off-by: NPeter Christensen <pch@ordbogen.com> Acked-by: NJulian Anastasov <ja@ssi.bg> Signed-off-by: NSimon Horman <horms@verge.net.au>
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