4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Nogah Frankel <nog...@mellanox.com>


[ 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 <nog...@mellanox.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 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) {


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