[PATCH 09/25] net: mcdmafec: ensure bus->name is NULL terminated after MDIO_NAME_LEN truncation

[Vladimir Oltean]

strncpy() simply bails out when copying a source string whose size
exceeds the destination string size, potentially leaving the destination
string unterminated.

One possible way to address is to pass MDIO_NAME_LEN - 1 and a
previously zero-initialized destination string, but this is more
difficult to maintain.

The chosen alternative is to use strlcpy(), which properly limits the
copy len in the (srclen >= size) case to "size - 1", and which is also
more efficient than the strncpy() byte-by-byte implementation by using
memcpy. The destination string returned by strlcpy() is always NULL
terminated.

Signed-off-by: Vladimir Oltean <vladimir.oltean at nxp.com>
---
 drivers/net/fsl_mcdmafec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/fsl_mcdmafec.c b/drivers/net/fsl_mcdmafec.c
index c20aef4ab28d..e103f79305e7 100644
--- a/drivers/net/fsl_mcdmafec.c
+++ b/drivers/net/fsl_mcdmafec.c
@@ -541,7 +541,7 @@ static int mcdmafec_probe(struct udevice *dev)
 	info->bus = mdio_alloc();
 	if (!info->bus)
 		return -ENOMEM;
-	strncpy(info->bus->name, dev->name, MDIO_NAME_LEN);
+	strlcpy(info->bus->name, dev->name, MDIO_NAME_LEN);
 	info->bus->read = mcffec_miiphy_read;
 	info->bus->write = mcffec_miiphy_write;
 
-- 
2.25.1