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@intel.com>
Link: https://patch.msgid.link/20250925063812.2269501-1-kaushlendra.kumar@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/firmware_loader/sysfs.c b/drivers/base/firmware_loader/sysfs.c
index add0b9b75eddc99132c9650cd7e3b132e40504bd..92e91050f96ab2a30837afca170ac368eab9ff79 100644 (file)
--- 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;