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Re: [PATCH] IOMMU: make domctl handler tolerate NULL domain

To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Juergen Gross <jgross@xxxxxxxx>
Date: Tue, 19 Apr 2022 12:08:12 +0200
Cc: Paul Durrant <paul@xxxxxxx>
Delivery-date: Tue, 19 Apr 2022 10:08:15 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 19.04.22 11:39, Jan Beulich wrote:

Besides the reporter's issue of hitting a NULL deref when !CONFIG_GDBSX,
XEN_DOMCTL_test_assign_device can legitimately end up having NULL passed
here, when the domctl was passed DOMID_INVALID.

Fixes: 71e617a6b8f6 ("use is_iommu_enabled() where appropriate...")
Reported-by: Cheyenne Wills <cheyenne.wills@xxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>


Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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References:
- [PATCH] IOMMU: make domctl handler tolerate NULL domain
  - From: Jan Beulich

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