linux-kernel - [PATCH v7 3/6] iio: filter: admv8818: fix integer overflow

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Message-ID: <20250316135008.155304-3-sam.winchenbach@framepointer.org>
Date: Sun, 16 Mar 2025 09:50:05 -0400
From: Sam Winchenbach <sam.winchenbach@...mepointer.org>
To: linux-kernel@...r.kernel.org
Cc: lars@...afoo.de,
	Michael.Hennerich@...log.com,
	antoniu.miclaus@...log.com,
	jic23@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org,
	sam.winchenbach@...mepointer.org,
	bpellegrino@...a.org,
	Sam Winchenbach <swinchenbach@...a.org>
Subject: [PATCH v7 3/6] iio: filter: admv8818: fix integer overflow

From: Sam Winchenbach <swinchenbach@...a.org>

HZ_PER_MHZ is only unsigned long. This math overflows, leading to
incorrect results.

Fixes: f34fe888ad05 ("iio:filter:admv8818: add support for ADMV8818")
Signed-off-by: Sam Winchenbach <swinchenbach@...a.org>
---
 drivers/iio/filter/admv8818.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/filter/admv8818.c b/drivers/iio/filter/admv8818.c
index 3d8740caa145..cd3aff9a2f7b 100644
--- a/drivers/iio/filter/admv8818.c
+++ b/drivers/iio/filter/admv8818.c
@@ -154,7 +154,7 @@ static int __admv8818_hpf_select(struct admv8818_state *st, u64 freq)
 	}
 
 	/* Close HPF frequency gap between 12 and 12.5 GHz */
-	if (freq >= 12000 * HZ_PER_MHZ && freq <= 12500 * HZ_PER_MHZ) {
+	if (freq >= 12000ULL * HZ_PER_MHZ && freq < 12500ULL * HZ_PER_MHZ) {
 		hpf_band = 3;
 		hpf_step = 15;
 	}
-- 
2.48.1