diff options
| author | Nikita Kiryushin <kiryushin@ancud.ru> | 2023-11-09 21:08:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-01-26 02:35:14 +0300 |
| commit | d1ac288b2742aa4af746c5613bac71760fadd1c4 (patch) | |
| tree | 44ed0e007bd2ad5b14b4f2ab8ea2fe1030cdfe11 | |
| parent | 39af144b6d01d9b40f52e5d773e653957e6c379c (diff) | |
| download | linux-d1ac288b2742aa4af746c5613bac71760fadd1c4.tar.xz | |
ACPI: LPIT: Avoid u32 multiplication overflow
[ Upstream commit 56d2eeda87995245300836ee4dbd13b002311782 ]
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@ancud.ru>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/acpi/acpi_lpit.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |