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net: sched: cbs: Avoid division by zero when calculating the port rate

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[ Upstream commit 83c8c3cf45 ]

As explained in the "net: sched: taprio: Avoid division by zero on
invalid link speed" commit, it is legal for the ethtool API to return
zero as a link speed. So guard against it to ensure we don't perform a
division by zero in kernel.

Fixes: e0a7683d30 ("net/sched: cbs: fix port_rate miscalculation")
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vladimir Oltean
2019-09-29 02:39:48 +03:00
committed by Greg Kroah-Hartman
parent 13260106d3
commit 172c529cb0
1 changed files with 1 additions and 1 deletions
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2
net/sched/sch_cbs.c
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@@ -310,7 +310,7 @@ static void cbs_set_port_rate(struct net_device *dev, struct cbs_sched_data *q)
if (err < 0)
goto skip;
if (ecmd.base.speed != SPEED_UNKNOWN)
if (ecmd.base.speed && ecmd.base.speed != SPEED_UNKNOWN)
speed = ecmd.base.speed;
skip: