On Mon, Sep 27, 2021 at 2:22 PM Vladimir Oltean vladimir.oltean@nxp.com wrote:
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@nxp.com
drivers/net/smc911x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c index 8f420261fa8d..5d9a73f23d75 100644 --- a/drivers/net/smc911x.c +++ b/drivers/net/smc911x.c @@ -425,7 +425,7 @@ static int smc911x_initialize_mii(struct smc911x_priv *priv) if (!mdiodev) return -ENOMEM;
strncpy(mdiodev->name, priv->dev.name, MDIO_NAME_LEN);
strlcpy(mdiodev->name, priv->dev.name, MDIO_NAME_LEN); mdiodev->read = smc911x_miiphy_read; mdiodev->write = smc911x_miiphy_write;-- 2.25.1
Reviewed-by: Ramon Fried rfried.dev@gmail.com