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 (file)
--- 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) {