From: Nogah Frankel <nogahf@mellanox.com>
Date: Mon, 4 Dec 2017 11:31:10 +0000 (+0200)
Subject: net_sched: red: Avoid devision by zero
X-Git-Tag: v4.14.22~48
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e428e8ce3a008852e56e25c2fab4bc14c9f16915;p=platform%2Fkernel%2Flinux-exynos.git

net_sched: red: Avoid devision by zero


[ Upstream commit 5c472203421ab4f928aa1ae9e1dbcfdd80324148 ]

Do not allow delta value to be zero since it is used as a divisor.

Fixes: 8af2a218de38 ("sch_red: Adaptative RED AQM")
Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/include/net/red.h b/include/net/red.h
index 9a93477..5918f78 100644
--- a/include/net/red.h
+++ b/include/net/red.h
@@ -179,7 +179,7 @@ static inline void red_set_parms(struct red_parms *p,
 	p->qth_max	= qth_max << Wlog;
 	p->Wlog		= Wlog;
 	p->Plog		= Plog;
-	if (delta < 0)
+	if (delta <= 0)
 		delta = 1;
 	p->qth_delta	= delta;
 	if (!max_P) {