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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Paolo Abeni <pabeni@redhat.com>,
        Mat Martineau <mathew.j.martineau@linux.intel.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 5.12 159/296] mptcp: drop unconditional pr_warn on bad opt
Date:   Mon, 31 May 2021 15:13:34 +0200
Message-Id: <20210531130709.212749806@linuxfoundation.org>
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From: Paolo Abeni <pabeni@redhat.com>

commit 3812ce895047afdb78dc750a236515416e0ccded upstream.

This is a left-over of early day. A malicious peer can flood
the kernel logs with useless messages, just drop it.

Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/mptcp/options.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -127,7 +127,6 @@ static void mptcp_parse_option(const str
 			memcpy(mp_opt->hmac, ptr, MPTCPOPT_HMAC_LEN);
 			pr_debug("MP_JOIN hmac");
 		} else {
-			pr_warn("MP_JOIN bad option size");
 			mp_opt->mp_join = 0;
 		}
 		break;