linux-kernel - [PATCH 4.14 080/114] net: phy: micrel: Use strlcpy() for ethtool::get

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Date:   Mon, 18 May 2020 19:36:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.14 080/114] net: phy: micrel: Use strlcpy() for ethtool::get_strings

From: Florian Fainelli <f.fainelli@...il.com>

commit 55f53567afe5f0cd2fd9e006b174c08c31c466f8 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: 2b2427d06426 ("phy: micrel: Add ethtool statistics counters")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/phy/micrel.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -674,8 +674,8 @@ static void kszphy_get_strings(struct ph
 	int i;

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