net: phy: broadcom: Use strlcpy() for ethtool::get_strings

commit 8a17eefa235f73b60c0ca7d397d2e4f66f85f413 upstream.

Our statistics strings are allocated at initialization without being
bound to a specific size, yet, we would copy ETH_GSTRING_LEN bytes using
memcpy() which would create out of bounds accesses, this was flagged by
KASAN. Replace this with strlcpy() to make sure we are bound the source
buffer size and we also always NUL-terminate strings.

Fixes: 820ee17b8d3b ("net: phy: broadcom: Add support code for reading PHY counters")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index 8d96c6f048d07fd0efd24e3a6f296f57afaa2e94..d5e0833d69b9b8a27c36842286d29029402a3156 100644 (file)
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -341,8 +341,8 @@ void bcm_phy_get_strings(struct phy_device *phydev, u8 *data)
        unsigned int i;
 
        for (i = 0; i < ARRAY_SIZE(bcm_phy_hw_stats); i++)
-               memcpy(data + i * ETH_GSTRING_LEN,
-                      bcm_phy_hw_stats[i].string, ETH_GSTRING_LEN);
+               strlcpy(data + i * ETH_GSTRING_LEN,
+                       bcm_phy_hw_stats[i].string, ETH_GSTRING_LEN);
 }
 EXPORT_SYMBOL_GPL(bcm_phy_get_strings);