4.19-stable review patch. If anyone has any objections, please let me know.
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From: Nikita Kiryushin kiryushin@ancud.ru
[ 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 --- 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 e43cb71b6972..c39c56904c52 100644 --- a/drivers/acpi/acpi_lpit.c +++ b/drivers/acpi/acpi_lpit.c @@ -106,7 +106,7 @@ static void lpit_update_residency(struct lpit_residency_info *info, struct acpi_lpit_native *lpit_native) { 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;