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Date: Sat, 21 Oct 2023 20:03:53 +0200
From: Christophe JAILLET <>
	Michael Hennerich <>,
	Alexander Aring <>,
	Stefan Schmidt <>,
	Miquel Raynal <>,
	"David S. Miller" <>,
	Eric Dumazet <>,
	Jakub Kicinski <>,
	Paolo Abeni <>,
	Marcel Holtmann <>
	Christophe JAILLET <>,
	Stefan Schmidt <>,,
Subject: [PATCH net] net: ieee802154: adf7242: Fix some potential buffer overflow in adf7242_stats_show()

strncat() usage in adf7242_debugfs_init() is wrong.
The size given to strncat() is the maximum number of bytes that can be
written, excluding the trailing NULL.

Here, the size that is passed, DNAME_INLINE_LEN, does not take into account
the size of "adf7242-" that is already in the array.

In order to fix it, use snprintf() instead.

Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC IEEE802154")
Signed-off-by: Christophe JAILLET <>
 drivers/net/ieee802154/adf7242.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
index a03490ba2e5b..cc7ddc40020f 100644
--- a/drivers/net/ieee802154/adf7242.c
+++ b/drivers/net/ieee802154/adf7242.c
@@ -1162,9 +1162,10 @@ static int adf7242_stats_show(struct seq_file *file, void *offset)
 static void adf7242_debugfs_init(struct adf7242_local *lp)
-	char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "adf7242-";
+	char debugfs_dir_name[DNAME_INLINE_LEN + 1];
-	strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
+	snprintf(debugfs_dir_name, sizeof(debugfs_dir_name),
+		 "adf7242-%s", dev_name(&lp->spi->dev));
 	lp->debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);

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