diff options
| author | Yi Xie <xieyi@kylinos.cn> | 2026-07-09 10:19:47 +0800 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2026-07-31 20:02:04 +0000 |
| commit | 22dfdc17ceadd2783a609947af621a7f697b7765 (patch) | |
| tree | 2c655a57400cbdca9cad8d580bd90867a1986af0 | |
| parent | 72e3b0311aa90568a4b42a64445d1d3e1dc5a34d (diff) | |
mshv_vtl: bounds-check cpu index in vtl mmap fault handler
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 <xieyi@kylinos.cn>
Reviewed-by: Naman Jain <namjain@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
| -rw-r--r-- | drivers/hv/mshv_vtl_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hv/mshv_vtl_main.c b/drivers/hv/mshv_vtl_main.c index 5ba1efb3b4e7..6e3c11c68171 100644 --- a/drivers/hv/mshv_vtl_main.c +++ b/drivers/hv/mshv_vtl_main.c @@ -802,7 +802,7 @@ 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. |