Messages in this thread | | | From | Z qiang <> | Date | Thu, 7 Sep 2023 10:13:23 +0800 | Subject | Re: [PATCH] workqueue: Fix UAF report by KASAN in pwq_release_workfn() |
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> > On Wed, Sep 06, 2023 at 10:12:34AM +0800, Z qiang wrote: > > Flush the pwq_release_worker is insufficient, the call_rcu() is > > invoked to release wq > > in pwq_release_workfn(), this is also asynchronous. > > But rcu_free_pwq() doesn't access wq or anything. The last access is from > the work function.
The rcu_free_wq() will access wq->cpu_pwq or unbound_attrs, but at this time, the kfree(wq) may have been called in alloc_workqueue().
Thanks Zqiang
> > Thanks. > > -- > tejun
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