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net/sched: sch_hfsc: Ensure inner classes have fsc curve
[ Upstream commit b3d26c5 ] HFSC assumes that inner classes have an fsc curve, but it is currently possible for classes without an fsc curve to become parents. This leads to bugs including a use-after-free. Don't allow non-root classes without HFSC_FSC to become parents. Fixes: 1da177e ("Linux-2.6.12-rc2") Reported-by: Budimir Markovic <markovicbudimir@gmail.com> Signed-off-by: Budimir Markovic <markovicbudimir@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Link: https://lore.kernel.org/r/20230824084905.422-1-markovicbudimir@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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