[PATCH] comedi: drivers: ni_tio: Fix arithmetic expression overflow

From: Denis Arefev
Date: Thu Jan 18 2024 - 02:36:40 EST


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.

Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>
Signed-off-by: Denis Arefev <arefev@xxxxxxxxx>
---
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