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/ftmac110.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ftmac110.c b/drivers/net/ftmac110.c index 265d813c4f89..7e54d4642ddf 100644 --- a/drivers/net/ftmac110.c +++ b/drivers/net/ftmac110.c @@ -476,7 +476,7 @@ int ftmac110_initialize(struct bd_info *bis) struct mii_dev *mdiodev = mdio_alloc(); if (!mdiodev) return -ENOMEM;
strncpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
strlcpy(mdiodev->name, dev->name, MDIO_NAME_LEN); mdiodev->read = ftmac110_mdio_read; mdiodev->write = ftmac110_mdio_write;-- 2.25.1
Reviewed-by: Ramon Fried rfried.dev@gmail.com