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Re: [PATCH v2] xen: vm_event: do not do vm_event_op for an invalid domain
- To: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- From: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- Date: Mon, 7 Apr 2025 18:55:56 -0400
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Mon, 07 Apr 2025 22:56:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, Mar 17, 2025 at 8:40 PM Volodymyr Babchuk
<Volodymyr_Babchuk@xxxxxxxx> wrote:
>
> A privileged domain can issue XEN_DOMCTL_vm_event_op with
> op->domain == DOMID_INVALID. In this case vm_event_domctl()
> function will get NULL as the first parameter and this will
> cause hypervisor panic, as it tries to derefer this pointer.
>
> Fix the issue by checking if valid domain is passed in.
>
> Fixes: 48b84249459f ("xen/vm-event: Drop unused u_domctl parameter from
> vm_event_domctl()")
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
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