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net: ieee802154: adf7242: Fix some potential buffer overflow in adf7242_stats_show()

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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: 7302b9d901 ("ieee802154/adf7242: Driver for ADF7242 MAC IEEE802154")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christophe JAILLET 2023-10-21 20:03:53 +02:00 committed by David S. Miller
parent 965f9b8c0c
commit ca082f019d
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ieee802154/adf7242.c
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@ -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);