netdev - [PATCH v2 net-next] net: 6lowpan: replace sprintf() with scnprintf() in debugfs

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Message-ID: <20260106171610.124138-2-katharasasikumar007@gmail.com>
Date: Tue,  6 Jan 2026 17:16:11 +0000
From: Kathara Sasikumar <katharasasikumar007@...il.com>
To: alex.aring@...il.com, horms@...nel.org
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, linux-bluetooth@...r.kernel.org, linux-wpan@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Kathara Sasikumar <katharasasikumar007@...il.com>
Subject: [PATCH v2 net-next] net: 6lowpan: replace sprintf() with scnprintf() in debugfs

sprintf() does not perform bounds checking on the destination buffer.
Replace it with scnprintf() to ensure the write stays within bounds.

No functional change intended.

Signed-off-by: Kathara Sasikumar <katharasasikumar007@...il.com>
---
v2:
 - Updated commit message wording
 - Targeted the patch to net-next
---
 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