From: Vladimir Oltean olteanv@gmail.com
[ Upstream commit 83c8c3cf45163f0c823db37be6ab04dfcf8ac751 ]
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: e0a7683d30e9 ("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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- net/sched/sch_cbs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c index 7c40b0f..ce7965c 100644 --- a/net/sched/sch_cbs.c +++ b/net/sched/sch_cbs.c @@ -311,7 +311,7 @@ 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: