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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-09-27 14:21:46 +0300 |
|---|---|---|
| committer | Ramon Fried <rfried.dev@gmail.com> | 2021-09-28 18:50:56 +0300 |
| commit | e7444a199a61ffcd605c9c51c9ec32d89be696b1 (patch) | |
| tree | 4bbd05819b9f6ff06b6ada8795c254c4536b48a0 | |
| parent | 5f1d1a194008d4dee8a7ed3783433062999e4678 (diff) | |
| download | u-boot-e7444a199a61ffcd605c9c51c9ec32d89be696b1.tar.xz | |
net: eepro100: ensure mdiodev->name is NULL terminated after MDIO_NAME_LEN truncation
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>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
| -rw-r--r-- | drivers/net/eepro100.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/eepro100.c b/drivers/net/eepro100.c index 934b881219..935cd9c99c 100644 --- a/drivers/net/eepro100.c +++ b/drivers/net/eepro100.c @@ -493,7 +493,7 @@ static int eepro100_initialize_mii(struct eepro100_priv *priv) if (!mdiodev) return -ENOMEM; - strncpy(mdiodev->name, priv->name, MDIO_NAME_LEN); + strlcpy(mdiodev->name, priv->name, MDIO_NAME_LEN); mdiodev->read = eepro100_miiphy_read; mdiodev->write = eepro100_miiphy_write; mdiodev->priv = priv; |