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Re: [PATCH] arm/vgic-v3: Fix data abort in get_vcpu_from_rdist()

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Julien Grall <julien@xxxxxxx>
Date: Wed, 8 Jul 2026 15:07:28 +0100
Cc: Michal Orzel <michal.orzel@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
Delivery-date: Wed, 08 Jul 2026 14:07:35 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Hi Andrew,

On 08/07/2026 13:17, Andrew Cooper wrote:

Just because vcpu_id is within d->max_vcpus doesn't mean d->vcpu[vcpu_id] is
non-NULL.  Use the proper accessor to look up a vcpu object.

Reported-by: Michal Orzel <michal.orzel@xxxxxxx>
Fixes: acf65e5a25a7 ("xen/arm: vgic-v3: Emulate correctly the re-distributor")
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>


Reviewed-by: Julien Grall <julien@xxxxxxx>

Cheers,

--
Julien Grall

References:
- [PATCH] arm/vgic-v3: Fix data abort in get_vcpu_from_rdist()
  - From: Andrew Cooper

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