From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 10 Sep 2019 20:10:43 +0200
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: [PATCH] KVM: s390: kvm_s390_vm_start_migration: check
 dirty_bitmap before using it as target for memset()
References: <20190910130215.23647-1-imammedo@redhat.com>
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To: Igor Mammedov <imammedo@redhat.com>
Cc: linux-kernel@vger.kernel.org, borntraeger@de.ibm.com, david@redhat.com, cohuck@redhat.com, frankja@linux.ibm.com, gor@linux.ibm.com, imbrenda@linux.ibm.com, linux-s390@vger.kernel.org, kvm@vger.kernel.org, stable@vger.kernel.org

On Tue, Sep 10, 2019 at 09:02:15AM -0400, Igor Mammedov wrote:
> Make sure that ms->dirty_bitmap is set before using it or
> print a warning and return -ENIVAL otherwise.
...
> v2:
>    - drop WARN()
...
> +		if (!ms->dirty_bitmap)
> +			return -EINVAL;

The patch description needs an update. ;)