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/fsl_enetc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/fsl_enetc.c b/drivers/net/fsl_enetc.c index 566cdc7e546a..b7e2c1f0880c 100644 --- a/drivers/net/fsl_enetc.c +++ b/drivers/net/fsl_enetc.c @@ -270,7 +270,7 @@ static void enetc_start_pcs(struct udevice *dev) priv->imdio.read = enetc_mdio_read; priv->imdio.write = enetc_mdio_write; priv->imdio.priv = priv->port_regs + ENETC_PM_IMDIO_BASE;
strncpy(priv->imdio.name, dev->name, MDIO_NAME_LEN);
strlcpy(priv->imdio.name, dev->name, MDIO_NAME_LEN); if (!miiphy_get_dev_by_name(priv->imdio.name)) mdio_register(&priv->imdio); }-- 2.25.1
Reviewed-by: Ramon Fried rfried.dev@gmail.com