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Date:   Thu, 21 May 2020 20:46:02 +0200
From:   Marek Marczykowski-Górecki 
To:     Boris Ostrovsky <>
Cc:     Juergen Gross <>,,,
        Stefano Stabellini <>,
Subject: Re: [PATCH] xen/events: avoid NULL pointer dereference in

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:

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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