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

Ben Hutchings
2018-02-28T16:14:43Z

From: Nogah Frankel <nogahf@mellanox.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@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.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) {