linux-kernel - [PATCH] backlight: mp3309c: fix signedness bug in mp3309c_parse

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Date: Sat, 16 Mar 2024 12:45:27 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Flavio Suligoi <f.suligoi@...m.it>, Lee Jones <lee@...nel.org>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Jingoo Han <jingoohan1@...il.com>, Helge Deller <deller@....de>,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] backlight: mp3309c: fix signedness bug in
 mp3309c_parse_fwnode()

The "num_levels" variable is used to store error codes from
device_property_count_u32() so it needs to be signed.  This doesn't
cause an issue at runtime because devm_kcalloc() won't allocate negative
sizes.  However, it's still worth fixing.

Fixes: b54c828bdba9 ("backlight: mp3309c: Make use of device properties")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/video/backlight/mp3309c.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/video/backlight/mp3309c.c b/drivers/video/backlight/mp3309c.c
index c80a1481e742..4e98e60417d2 100644
--- a/drivers/video/backlight/mp3309c.c
+++ b/drivers/video/backlight/mp3309c.c
@@ -205,8 +205,9 @@ static int mp3309c_parse_fwnode(struct mp3309c_chip *chip,
 				struct mp3309c_platform_data *pdata)
 {
 	int ret, i;
-	unsigned int num_levels, tmp_value;
+	unsigned int tmp_value;
 	struct device *dev = chip->dev;
+	int num_levels;
 
 	if (!dev_fwnode(dev))
 		return dev_err_probe(dev, -ENODEV, "failed to get firmware node\n");
-- 
2.43.0