linux-kernel - [PATCH] namespace: Replace simple_strtoul with kstrtoul to parse boot params

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Message-ID: <20251214153141.218953-2-thorsten.blum@linux.dev>
Date: Sun, 14 Dec 2025 16:31:42 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] namespace: Replace simple_strtoul with kstrtoul to parse boot params

Replace simple_strtoul() with the recommended kstrtoul() for parsing the
'mhash_entries=' and 'mphash_entries=' boot parameters.

Check the return value of kstrtoul() and reject invalid values. This
adds error handling while preserving behavior for existing values, and
removes use of the deprecated simple_strtoul() helper.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 fs/namespace.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index c58674a20cad..a548369ddb9c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -49,20 +49,14 @@ static unsigned int mp_hash_shift __ro_after_init;
 static __initdata unsigned long mhash_entries;
 static int __init set_mhash_entries(char *str)
 {
-	if (!str)
-		return 0;
-	mhash_entries = simple_strtoul(str, &str, 0);
-	return 1;
+	return kstrtoul(str, 0, &mhash_entries) == 0;
 }
 __setup("mhash_entries=", set_mhash_entries);
 
 static __initdata unsigned long mphash_entries;
 static int __init set_mphash_entries(char *str)
 {
-	if (!str)
-		return 0;
-	mphash_entries = simple_strtoul(str, &str, 0);
-	return 1;
+	return kstrtoul(str, 0, &mphash_entries) == 0;
 }
 __setup("mphash_entries=", set_mphash_entries);
 
-- 
Thorsten Blum <thorsten.blum@...ux.dev>
GPG: 1D60 735E 8AEF 3BE4 73B6  9D84 7336 78FD 8DFE EAD4