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ACPI: CPPC: Avoid out of bounds access when parsing _CPC data

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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: 337aadff8e ("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>
This commit is contained in:
Rafael J. Wysocki 2022-03-22 17:02:05 +01:00
parent 242ba6656d
commit 40d8abf364
1 changed files with 5 additions and 0 deletions
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5
drivers/acpi/cppc_acpi.c
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@ -679,6 +679,11 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
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);