netfilter: nft_payload: don't allow th access for fragments

netfilter: nft_payload: don't allow th access for fragments

[ Upstream commit a9e8503def0fd4ed89ade1f61c315f904581d439 ]

Loads relative to ->thoff naturally expect that this points to the
transport header, but this is only true if pkt->fragoff == 0.

This has little effect for rulesets with connection tracking/nat because
these enable ip defra. For other rulesets this prevents false matches.

Fixes: 96518518cc41 ("netfilter: add nftables")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>