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net/sched: sch_hfsc: Ensure inner classes have fsc curve

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[ Upstream commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f ]

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: 1da177e4c3 ("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>
This commit is contained in:
Budimir Markovic 2023-08-24 01:49:05 -07:00 committed by Greg Kroah-Hartman
parent d943efd794
commit 7c62e0c3c6
1 changed files with 4 additions and 0 deletions
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4
net/sched/sch_hfsc.c
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@ -1021,6 +1021,10 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
if (parent == NULL)
return -ENOENT;
}
if (!(parent->cl_flags & HFSC_FSC) && parent != &q->root) {
NL_SET_ERR_MSG(extack, "Invalid parent - parent class must have FSC");
return -EINVAL;
}
if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0)
return -EINVAL;