On Thu, May 21, 2020 at 01:22:03PM -0400, Boris Ostrovsky wrote: > On 3/19/20 3:14 AM, Juergen Gross wrote: > > There have been reports of races in evtchn_from_irq() where the info > > pointer has been NULL. > > > > Avoid that case by testing info before dereferencing it. > > > > In order to avoid accessing a just freed info structure do the kfree() > > via kfree_rcu(). > > > Looks like noone ever responded to this. > > > This change looks fine but is there a background on the problem? I > looked in the archives and didn't find the relevant discussion. Here is the original bug report: https://xen.markmail.org/thread/44apwkwzeme4uavo -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?
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