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Subject: Re: [PATCH] xen/gntdev: fix gntdev_mmap() error exit path
To:     xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        stable@vger.kernel.org,
        =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= 
        <marmarek@invisiblethingslab.com>
References: <20210423054038.26696-1-jgross@suse.com>
From:   Juergen Gross <jgross@suse.com>
Message-ID: <4b034ebb-4b41-ab00-3cf7-d8943e62474a@suse.com>
Date:   Mon, 10 May 2021 11:26:31 +0200
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From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
 Stefano Stabellini <sstabellini@kernel.org>, stable@vger.kernel.org,
 =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= <marmarek@invisiblethingslab.com>
Message-ID: <4b034ebb-4b41-ab00-3cf7-d8943e62474a@suse.com>
Subject: Re: [PATCH] xen/gntdev: fix gntdev_mmap() error exit path
References: <20210423054038.26696-1-jgross@suse.com>
In-Reply-To: <20210423054038.26696-1-jgross@suse.com>

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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.
>=20
> One reason for failure is e.g. a signal pending for the running
> process.
>=20
> Fixes: d3eeb1d77c5d0af ("xen/gntdev: use mmu_interval_notifier_insert")=

> Cc: stable@vger.kernel.org
> Reported-by: Marek Marczykowski-G=C3=B3recki <marmarek@invisiblethingsl=
ab.com>
> Tested-by: Marek Marczykowski-G=C3=B3recki <marmarek@invisiblethingslab=
=2Ecom>
> Signed-off-by: Juergen Gross <jgross@suse.com>

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


Juergen

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