linux-kernel - [PATCH 08/13] media: ar0521: don't overflow when checking PLL values

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Message-ID: <39b23d468eea2714a24a94cb6c20aef5aff492e6.1729074076.git.mchehab+huawei@kernel.org>
Date: Wed, 16 Oct 2024 12:22:24 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: 
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Krzysztof Hałasa <khalasa@...p.pl>,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH 08/13] media: ar0521: don't overflow when checking PLL values

The PLL checks are comparing 64 bit integers with 32 bit
ones. Depending on the values of the variables, this may
underflow.

Fix it ensuring that both sides of the expression are u64.

Fixes: 852b50aeed15 ("media: On Semi AR0521 sensor driver")
Cc: stable@...r.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/media/i2c/ar0521.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ar0521.c b/drivers/media/i2c/ar0521.c
index fc27238dd4d3..24873149096c 100644
--- a/drivers/media/i2c/ar0521.c
+++ b/drivers/media/i2c/ar0521.c
@@ -255,10 +255,10 @@ static u32 calc_pll(struct ar0521_dev *sensor, u32 freq, u16 *pre_ptr, u16 *mult
 			continue; /* Minimum value */
 		if (new_mult > 254)
 			break; /* Maximum, larger pre won't work either */
-		if (sensor->extclk_freq * (u64)new_mult < AR0521_PLL_MIN *
+		if (sensor->extclk_freq * (u64)new_mult < (u64)AR0521_PLL_MIN *
 		    new_pre)
 			continue;
-		if (sensor->extclk_freq * (u64)new_mult > AR0521_PLL_MAX *
+		if (sensor->extclk_freq * (u64)new_mult > (u64)AR0521_PLL_MAX *
 		    new_pre)
 			break; /* Larger pre won't work either */
 		new_pll = div64_round_up(sensor->extclk_freq * (u64)new_mult,
-- 
2.47.0