Naman, Saurabh, please review this.
On Thu, Jul 09, 2026 at 10:19:47AM +0800, Yi Xie wrote:
> cpu is taken from pgoff & 0xffff. cpu_online() does not reject cpu >=
> nr_cpu_ids, and per_cpu_ptr() can then walk off __per_cpu_offset.
>
> Signed-off-by: Yi Xie <[email protected]>
> ---
> drivers/hv/mshv_vtl_main.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/hv/mshv_vtl_main.c b/drivers/hv/mshv_vtl_main.c
> index 0d3d4161974f..fc50c44ac1bd 100644
> --- a/drivers/hv/mshv_vtl_main.c
> +++ b/drivers/hv/mshv_vtl_main.c
> @@ -801,7 +801,7 @@ static vm_fault_t mshv_vtl_fault(struct vm_fault *vmf)
> int cpu = vmf->pgoff & MSHV_PG_OFF_CPU_MASK;
> int real_off = vmf->pgoff >> MSHV_REAL_OFF_SHIFT;
>
> - if (!cpu_online(cpu))
> + if (cpu >= nr_cpu_ids || !cpu_online(cpu))
> return VM_FAULT_SIGBUS;
> /*
> * CPU Hotplug is not supported in VTL2 in OpenHCL, where this kernel
> driver exists.
> --
> 2.34.1
