linux-kernel - [PATCH] block: Replace deprecated strcpy in devt_from

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Message-ID: <20251113131834.45852-1-thorsten.blum@linux.dev>
Date: Thu, 13 Nov 2025 14:18:33 +0100
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Jens Axboe <axboe@...nel.dk>
Cc: linux-hardening@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] block: Replace deprecated strcpy in devt_from_devname

Use strnlen() and sizeof(s) instead of hard-coding 31 bytes.

strcpy() is deprecated and uses an additional strlen() internally; use
memcpy() directly since we already know the length of 'name' and that it
is guaranteed to be NUL-terminated.

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 block/early-lookup.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/block/early-lookup.c b/block/early-lookup.c
index 3fb57f7d2b12..5c30a0cc85a0 100644
--- a/block/early-lookup.c
+++ b/block/early-lookup.c
@@ -155,10 +155,11 @@ static int __init devt_from_devname(const char *name, dev_t *devt)
 	int part;
 	char s[32];
 	char *p;
+	size_t name_len = strnlen(name, sizeof(s));
 
-	if (strlen(name) > 31)
+	if (name_len == sizeof(s))
 		return -EINVAL;
-	strcpy(s, name);
+	memcpy(s, name, name_len + 1);
 	for (p = s; *p; p++) {
 		if (*p == '/')
 			*p = '!';
-- 
2.51.1