linux-kernel - [PATCH 5.16 0955/1017] ACPI: CPPC: Avoid out of bounds access when parsing

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Date:   Tue,  5 Apr 2022 09:31:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <oliver.sang@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Huang Rui <ray.huang@....com>
Subject: [PATCH 5.16 0955/1017] ACPI: CPPC: Avoid out of bounds access when parsing _CPC data

From: Rafael J. Wysocki <rafael.j.wysocki@...el.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@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Huang Rui <ray.huang@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/acpi/cppc_acpi.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -690,6 +690,11 @@ 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);