From: Dave Jones <davej@codemonkey.org.uk>
Date: Mon, 4 Apr 2016 19:11:50 +0000 (-0400)
Subject: af_packet: tone down the Tx-ring unsupported spew.
X-Git-Tag: v4.4.193~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cc953562e2e293575514c40806eee438a967364;p=thirdparty%2Fkernel%2Fstable.git

af_packet: tone down the Tx-ring unsupported spew.

[ Upstream commit 6ae81ced378820c4c6434b1dedba14a7122df310 ]

Trinity and other fuzzers can hit this WARN on far too easily,
resulting in a tainted kernel that hinders automated fuzzing.

Replace it with a rate-limited printk.

Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 5d8988185c591..0dd9fc3f57e87 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4176,7 +4176,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
 
 	/* Opening a Tx-ring is NOT supported in TPACKET_V3 */
 	if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
-		WARN(1, "Tx-ring is not supported.\n");
+		net_warn_ratelimited("Tx-ring is not supported.\n");
 		goto out;
 	}