linux-kernel - Re: [PATCH] xen/gntdev: fix gntdev

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Message-ID: <4b034ebb-4b41-ab00-3cf7-d8943e62474a@suse.com>
Date:   Mon, 10 May 2021 11:26:31 +0200
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>
Subject: Re: [PATCH] xen/gntdev: fix gntdev_mmap() error exit path

On 23.04.21 07:40, Juergen Gross wrote:
> Commit d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert")
> introduced an error in gntdev_mmap(): in case the call of
> mmu_interval_notifier_insert_locked() fails the exit path should not
> call mmu_interval_notifier_remove(), as this might result in NULL
> dereferences.
> 
> One reason for failure is e.g. a signal pending for the running
> process.
> 
> Fixes: d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert")
> Cc: stable@...r.kernel.org
> Reported-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
> Tested-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Pushed to xen/tip.git for-linus-5.13b


Juergen

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