[lvc-project] [PATCH] ACPI: LPIT: fix u32 multiplication overflow

[Nikita Kiryushin]

In lpit_update_residency there is a possibility of overflow
in multiplication, if tsc_khz is large enough (> UINT_MAX/1000).

Change multiplication to mul_u32_u32.

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

Fixes: eeb2d80d502a ("ACPI / LPIT: Add Low Power Idle Table (LPIT) support")
Signed-off-by: Nikita Kiryushin <kiryushin at ancud.ru>
---
  drivers/acpi/acpi_lpit.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c
index c5598b6d5db8..794962c5c88e 100644
--- a/drivers/acpi/acpi_lpit.c
+++ b/drivers/acpi/acpi_lpit.c
@@ -105,7 +105,7 @@ static void lpit_update_residency(struct 
lpit_residency_info *info,
  		return;
   	info->frequency = lpit_native->counter_frequency ?
-				lpit_native->counter_frequency : tsc_khz * 1000;
+				lpit_native->counter_frequency : mul_u32_u32(tsc_khz, 1000U);
  	if (!info->frequency)
  		info->frequency = 1;
  -- 2.34.1