5.4-stable review patch. If anyone has any objections, please let me know.
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From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ Upstream commit ca082f019d8fbb983f03080487946da714154bae ]
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 christophe.jaillet@wanadoo.fr Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- 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 cb29da961e12b..179e3e42b5f03 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);