linux-kernel - [PATCH -next 1/2] wifi: mt76: mt7996: fix overflows seen when writing limit attributes

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Message-Id: <20241202031917.23741-2-luoxueqin@kylinos.cn>
Date: Mon,  2 Dec 2024 11:19:16 +0800
From: xueqin Luo <luoxueqin@...inos.cn>
To: nbd@....name,
	lorenzo@...nel.org,
	ryder.lee@...iatek.com,
	shayne.chen@...iatek.com,
	sean.wang@...iatek.com,
	kvalo@...nel.org,
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	angelogioacchino.delregno@...labora.com
Cc: howard-yh.hsu@...iatek.com,
	benjamin-jw.lin@...iatek.com,
	StanleyYP.Wang@...iatek.com,
	Bo.Jiao@...iatek.com,
	sujuan.chen@...iatek.com,
	chui-hao.chiu@...iatek.com,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	make24@...as.ac.cn,
	xueqin Luo <luoxueqin@...inos.cn>
Subject: [PATCH -next 1/2] wifi: mt76: mt7996: fix overflows seen when writing limit attributes

DIV_ROUND_CLOSEST() after kstrtoul() results in an overflow if a large
number such as 18446744073709551615 is provided by the user.
Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.
This commit was inspired by commit: 57ee12b6c514.

Fixes: 6879b2e94172 ("wifi: mt76: mt7996: add thermal sensor device support")
Signed-off-by: xueqin Luo <luoxueqin@...inos.cn>
---
 drivers/net/wireless/mediatek/mt76/mt7996/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/init.c b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
index 5e96973226bb..3a175222f8ba 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
@@ -85,7 +85,7 @@ static ssize_t mt7996_thermal_temp_store(struct device *dev,
 		return ret;
 
 	mutex_lock(&phy->dev->mt76.mutex);
-	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 40, 130);
+	val = DIV_ROUND_CLOSEST(clamp_val(val, 40 * 1000, 130 * 1000), 1000);
 
 	/* add a safety margin ~10 */
 	if ((i - 1 == MT7996_CRIT_TEMP_IDX &&
-- 
2.34.1