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
