netfilter: nft_range: add the missing NULL pointer check
Otherwise, kernel panic will happen if the user does not specify the related attributes. Fixes: 0f3cd9b3 ("netfilter: nf_tables: add range expression") Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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