Commit 77003e53 authored by Vladimir Oltean's avatar Vladimir Oltean Committed by Ramon Fried
Browse files

net: mvgbe: 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: default avatarVladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried's avatarRamon Fried <rfried.dev@gmail.com>
parent 47aa50d7
......@@ -883,7 +883,7 @@ int mvgbe_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 = smi_reg_read;
mdiodev->write = smi_reg_write;
......
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