From: Nikita Kiryushin Date: Thu, 9 Nov 2023 18:08:59 +0000 (+0300) Subject: ACPI: LPIT: Avoid u32 multiplication overflow X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=56d2eeda87995245300836ee4dbd13b002311782;p=linux.git ACPI: LPIT: Avoid u32 multiplication overflow 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 Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c index c5598b6d5db8b..794962c5c88e9 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;