linux-kernel - [PATCH] firmware_loader: Replace simple

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Message-Id: <20250925063812.2269501-1-kaushlendra.kumar@intel.com>
Date: Thu, 25 Sep 2025 12:08:12 +0530
From: Kaushlendra Kumar <kaushlendra.kumar@...el.com>
To: mcgrof@...nel.org,
	russ.weight@...ux.dev,
	dakr@...nel.org,
	gregkh@...uxfoundation.org,
	rafael@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Kaushlendra Kumar <kaushlendra.kumar@...el.com>
Subject: [PATCH] firmware_loader: Replace simple_strtol() with kstrtoint()

Replace deprecated simple_strtol() calls with kstrtoint() in
timeout_store() and firmware_loading_store() functions to
improve input validation and error handling. The simple_strtol()
function does not provide proper error checking for invalid input,
while kstrtoint() returns an error for malformed strings.

This change adds proper validation for user input from sysfs attributes,
returning -EINVAL for invalid numeric strings instead of silently accepting
potentially malformed input. The behavior for valid numeric input remains
unchanged.

The simple_strtol() function is deprecated in favor of kstrtoint() family
functions which provide better error handling and are recommended for new
code and replacements.

Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@...el.com>
---
 drivers/base/firmware_loader/sysfs.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/base/firmware_loader/sysfs.c b/drivers/base/firmware_loader/sysfs.c
index add0b9b75edd..92e91050f96a 100644
--- a/drivers/base/firmware_loader/sysfs.c
+++ b/drivers/base/firmware_loader/sysfs.c
@@ -47,7 +47,10 @@ static ssize_t timeout_show(const struct class *class, const struct class_attrib
 static ssize_t timeout_store(const struct class *class, const struct class_attribute *attr,
 			     const char *buf, size_t count)
 {
-	int tmp_loading_timeout = simple_strtol(buf, NULL, 10);
+	int tmp_loading_timeout;
+
+	if (kstrtoint(buf, 10, &tmp_loading_timeout))
+		return -EINVAL;

 	if (tmp_loading_timeout < 0)
 		tmp_loading_timeout = 0;
@@ -157,7 +160,10 @@ static ssize_t firmware_loading_store(struct device *dev,
 	struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
 	struct fw_priv *fw_priv;
 	ssize_t written = count;
-	int loading = simple_strtol(buf, NULL, 10);
+	int loading;
+
+	if (kstrtoint(buf, 10, &loading))
+		return -EINVAL;

 	mutex_lock(&fw_lock);
 	fw_priv = fw_sysfs->fw_priv;
-- 
2.34.1