Messages in this thread | | | Date | Wed, 11 Sep 2019 09:34:51 +0200 | From | Michal Hocko <> | Subject | Re: [PATCH] driver core: ensure a device has valid node id in device_add() |
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On Wed 11-09-19 15:22:30, Yunsheng Lin wrote: [...] > It seems that there is no protection that prevent setting the node > of device to an invalid node. > And the kernel does have a few different check now: > 1) some does " < 0" check; > 2) some does "== NUMA_NO_NODE" check; > 3) some does ">= MAX_NUMNODES" check; > 4) some does "< 0 || >= MAX_NUMNODES || !node_online(node)" check. > > We need to be consistent about the checking, right?
You can try and chase each of them and see what to do with them. I suspect they are a result of random attempts to fortify the code in many cases. Consistency is certainly good but spreading more checks all over the place just adds more cargo cult. Each check should be reasonably justified.
-- Michal Hocko SUSE Labs
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