netdev - [patch net-next v2] ethtool: cabletest: fix wrong conditional check

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Message-ID: <20240828021005.9886-1-djahchankoike@gmail.com>
Date: Tue, 27 Aug 2024 23:09:19 -0300
From: Diogo Jahchan Koike <djahchankoike@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Diogo Jahchan Koike <djahchankoike@...il.com>,
	syzbot+5cf270e2069645b6bd2c@...kaller.appspotmail.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [patch net-next v2] ethtool: cabletest: fix wrong conditional check

In ethnl_act_cable_test_tdr, phydev is tested for the condition of being
null or an error by checking IS_ERR_OR_NULL, however the result is being
negated and lets a null phydev go through. Simply removing the logical
NOT on the conditional suffices.

Reported-by: syzbot+5cf270e2069645b6bd2c@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=5cf270e2069645b6bd2c
Fixes: 3688ff3077d3 ("net: ethtool: cable-test: Target the command to the requested PHY")
Signed-off-by: Diogo Jahchan Koike <djahchankoike@...il.com>
---
The previous patch was sent without the appropriate tags, apologize for
that.
---
 net/ethtool/cabletest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ethtool/cabletest.c b/net/ethtool/cabletest.c
index d365ad5f5434..f25da884b3dd 100644
--- a/net/ethtool/cabletest.c
+++ b/net/ethtool/cabletest.c
@@ -346,7 +346,7 @@ int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info)
 	phydev = ethnl_req_get_phydev(&req_info,
 				      tb[ETHTOOL_A_CABLE_TEST_TDR_HEADER],
 				      info->extack);
-	if (!IS_ERR_OR_NULL(phydev)) {
+	if (IS_ERR_OR_NULL(phydev)) {
 		ret = -EOPNOTSUPP;
 		goto out_dev_put;
 	}
-- 
2.43.0