linux-kernel - [PATCH v2] platform/x86/intel: pmc: fix ltr decode in pmc_core_ltr

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Message-ID: <20250123220739.68087-1-d.kandybka@gmail.com>
Date: Fri, 24 Jan 2025 01:07:39 +0300
From: Dmitry Kandybka <d.kandybka@...il.com>
To: Rajneesh Bhardwaj <irenic.rajneesh@...il.com>
Cc: David E Box <david.e.box@...el.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH v2] platform/x86/intel: pmc: fix ltr decode in pmc_core_ltr_show()

In pmc_core_ltr_show(), promote 'val' to 'u64' to avoid possible integer
overflow. Values (10 bit) are multiplied by the scale, the result of
expression is in a range from 1 to 34,326,183,936 which is bigger then
UINT32_MAX. Compile tested only.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Dmitry Kandybka <d.kandybka@...il.com>
---
v1 -> v2: 'val' variable declared as 'u64' instead of type casting
at usage points

 drivers/platform/x86/intel/pmc/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 10f04b944117..1ee0fb5f8250 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -626,8 +626,8 @@ static u32 convert_ltr_scale(u32 val)
 static int pmc_core_ltr_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
-	u64 decoded_snoop_ltr, decoded_non_snoop_ltr;
-	u32 ltr_raw_data, scale, val;
+	u64 decoded_snoop_ltr, decoded_non_snoop_ltr, val;
+	u32 ltr_raw_data, scale;
 	u16 snoop_ltr, nonsnoop_ltr;
 	unsigned int i, index, ltr_index = 0;
 
-- 
2.47.1