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authorVladimir Oltean <olteanv@gmail.com>2019-09-29 02:39:48 +0300
committerDavid S. Miller <davem@davemloft.net>2019-10-01 09:51:39 -0700
commit83c8c3cf45163f0c823db37be6ab04dfcf8ac751 (patch)
tree539bcbc710c0ab376da104a69db2a2f73093fbe6 /net/sched
parent9a9251a3534745d08a92abfeca0ca467b912b5f6 (diff)
downloadlinux-83c8c3cf45163f0c823db37be6ab04dfcf8ac751.tar.bz2
net: sched: cbs: Avoid division by zero when calculating the port rate
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>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_cbs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index 1bef152c5721..b2905b03a432 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -306,7 +306,7 @@ 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: