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[ Upstream commit13e55fbaec] Prevent a dst ref loop on input in rpl_iptunnel. Fixes:a7a29f9c36("net: ipv6: add rpl sr tunnel") Cc: Alexander Aring <alex.aring@gmail.com> Cc: Ido Schimmel <idosch@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: Justin Iurman <justin.iurman@uliege.be> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>