Commit 55f53567 authored Mar 02, 2018 by Florian Fainelli Committed by David S. Miller Mar 06, 2018

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

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: 2b2427d0 ("phy: micrel: Add ethtool statistics counters")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 98409b2b

drivers/net/phy/micrel.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -664,7 +664,7 @@ static void kszphy_get_strings(struct phy_device phydev, u8 data)
		int i;

		for (i = 0; i < ARRAY_SIZE(kszphy_hw_stats); i++) {
		memcpy(data + i * ETH_GSTRING_LEN,
		strlcpy(data + i * ETH_GSTRING_LEN,
		kszphy_hw_stats[i].string, ETH_GSTRING_LEN);
		}
		}