linux-kernel - [PATCH] comedi: drivers: ni_tio: Fix arithmetic expression overflow

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Message-Id: <20240117124229.37455-1-arefev@swemel.ru>
Date: Wed, 17 Jan 2024 15:42:29 +0300
From: Denis Arefev <arefev@...mel.ru>
To: Ian Abbott <abbotti@....co.uk>
Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>,
	linux-kernel@...r.kernel.org (open list),
	lvc-project@...uxtesting.org
Subject: [PATCH] comedi: drivers: ni_tio: Fix arithmetic expression overflow

The value of an arithmetic expression period_ns * 1000 is subject
to overflow due to a failure to cast operands to a larger data
type before performing arithmetic

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

Signed-off-by: Denis Arefev <arefev@...mel.ru>
---
 drivers/comedi/drivers/ni_tio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/ni_tio.c b/drivers/comedi/drivers/ni_tio.c
index da6826d77e60..acc914903c70 100644
--- a/drivers/comedi/drivers/ni_tio.c
+++ b/drivers/comedi/drivers/ni_tio.c
@@ -800,7 +800,7 @@ static int ni_tio_set_clock_src(struct ni_gpct *counter,
 				GI_PRESCALE_X2(counter_dev->variant) |
 				GI_PRESCALE_X8(counter_dev->variant), bits);
 	}
-	counter->clock_period_ps = period_ns * 1000;
+	counter->clock_period_ps = period_ns * 1000UL;
 	ni_tio_set_sync_mode(counter);
 	return 0;
 }
-- 
2.25.1