| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 569/599] ACPI: CPPC: Avoid out of bounds access when parsing _CPC data | Date | Tue, 5 Apr 2022 09:34:23 +0200 |
| |
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
commit 40d8abf364bcab23bc715a9221a3c8623956257b upstream.
If the NumEntries field in the _CPC return package is less than 2, do not attempt to access the "Revision" element of that package, because it may not be present then.
Fixes: 337aadff8e45 ("ACPI: Introduce CPU performance controls using CPPC") BugLink: https://lore.kernel.org/lkml/20220322143534.GC32582@xsang-OptiPlex-9020/ Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/acpi/cppc_acpi.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -719,6 +719,11 @@ int acpi_cppc_processor_probe(struct acp cpc_obj = &out_obj->package.elements[0]; if (cpc_obj->type == ACPI_TYPE_INTEGER) { num_ent = cpc_obj->integer.value; + if (num_ent <= 1) { + pr_debug("Unexpected _CPC NumEntries value (%d) for CPU:%d\n", + num_ent, pr->id); + goto out_free; + } } else { pr_debug("Unexpected entry type(%d) for NumEntries\n", cpc_obj->type);
|