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

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>
This commit is contained in:
Budimir Markovic 2023-08-24 01:49:05 -07:00 committed by Jakub Kicinski
parent c4413a20fa
commit b3d26c5702
1 changed files with 4 additions and 0 deletions
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4
net/sched/sch_hfsc.c
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@ -1012,6 +1012,10 @@ 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;