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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-09-27 14:21:57 +0300 |
|---|---|---|
| committer | Ramon Fried <rfried.dev@gmail.com> | 2021-09-28 18:50:56 +0300 |
| commit | 30c40398b65c4109018124ccdbc3bf0edc741050 (patch) | |
| tree | a69f4657e86c336e716970cfb2d1a5e460affb0c /drivers/net | |
| parent | 7616240b4dd6b8322b79327f45150e0cc0bf6a79 (diff) | |
| download | u-boot-30c40398b65c4109018124ccdbc3bf0edc741050.tar.xz | |
net: smc911x: 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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/smc911x.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c index 8f420261fa..5d9a73f23d 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; |