linux-kernel - Re: [PATCH] xen/events: avoid NULL pointer dereference in evtchn_from

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Message-ID: <1f8aab2c-dddc-494c-708d-85087c8d4e57@oracle.com>
Date:   Thu, 19 Mar 2020 12:01:05 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, stable@...r.kernel.org
Subject: Re: [PATCH] xen/events: avoid NULL pointer dereference in
 evtchn_from_irq()


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.


Do you have an example of how this race happens (and how moving kfree to 
rcu will help)?

(I am mostly wondering whether we'd be masking a more serious problem)

-boris