linux-kernel - [PATCH v2 net 1/2] openvswitch: switch from WARN to pr

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Message-Id: <20221025105018.466157-2-aconole@redhat.com>
Date:   Tue, 25 Oct 2022 06:50:17 -0400
From:   Aaron Conole <aconole@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Pravin B Shelar <pshelar@....org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Thomas Graf <tgraf@...g.ch>,
        Kevin Sprague <ksprague0711@...il.com>, dev@...nvswitch.org,
        Eelco Chaudron <echaudro@...hat.com>,
        Ilya Maximets <i.maximets@....org>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH v2 net 1/2] openvswitch: switch from WARN to pr_warn

As noted by Paolo Abeni, pr_warn doesn't generate any splat and can still
preserve the warning to the user that feature downgrade occurred.  We
likely cannot introduce other kinds of checks / enforcement here because
syzbot can generate different genl versions to the datapath.

Reported-by: syzbot+31cde0bef4bbf8ba2d86@...kaller.appspotmail.com
Fixes: 44da5ae5fbea ("openvswitch: Drop user features if old user space attempted to create datapath")
Cc: Thomas Graf <tgraf@...g.ch>
Signed-off-by: Aaron Conole <aconole@...hat.com>
---
 net/openvswitch/datapath.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index c8a9075ddd0a..155263e73512 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -1616,7 +1616,8 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb,
 	if (IS_ERR(dp))
 		return;
 
-	WARN(dp->user_features, "Dropping previously announced user features\n");
+	pr_warn("%s: Dropping previously announced user features\n",
+		ovs_dp_name(dp));
 	dp->user_features = 0;
 }
 
-- 
2.34.3