linux-kernel - [PATCH] net: 6lowpan: replace sprintf() with scnprintf() in debugfs

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Message-ID: <20251205175324.619870-1-katharasasikumar007@gmail.com>
Date: Fri,  5 Dec 2025 17:53:24 +0000
From: Kathara Sasikumar <katharasasikumar007@...il.com>
To: alex.aring@...il.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, horms@...nel.org, david.hunter.linux@...il.com, linux-bluetooth@...r.kernel.org, linux-wpan@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, shuah@...nel.org, skhan@...uxfoundation.org, katharasasikumar007@...il.com
Subject: [PATCH] net: 6lowpan: replace sprintf() with scnprintf() in debugfs

sprintf() does not perform bounds checking on the destination buffer and
is deprecated in the kernel as documented in
Documentation/process/deprecated.rst.

Replace it with scnprintf() to ensure the write stays within bounds.

No functional change intended.

Signed-off-by: Kathara Sasikumar <katharasasikumar007@...il.com>
---
 net/6lowpan/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c
index 600b9563bfc5..d45ace484143 100644
--- a/net/6lowpan/debugfs.c
+++ b/net/6lowpan/debugfs.c
@@ -173,7 +173,7 @@ static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
 	if (WARN_ON_ONCE(id >= LOWPAN_IPHC_CTX_TABLE_SIZE))
 		return;
 
-	sprintf(buf, "%d", id);
+	scnprintf(buf, sizeof(buf), "%d", id);
 
 	root = debugfs_create_dir(buf, ctx);
 
-- 
2.51.0