linux-kernel - [PATCH 3.16 056/254] net_sched: red: Avoid devision by zero

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Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Nogah Frankel" <nogahf@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 056/254] net_sched: red: Avoid devision by zero

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Nogah Frankel <nogahf@...lanox.com>

commit 5c472203421ab4f928aa1ae9e1dbcfdd80324148 upstream.

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@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/net/red.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/red.h
+++ b/include/net/red.h
@@ -178,7 +178,7 @@ static inline void red_set_parms(struct
 	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) {