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net: sched: lock imbalance in hhf qdisc 

hhf_change() takes the sch_tree_lock and releases it but misses the
error cases. Fix the missed case here.

To reproduce try a command like this,

# tc qdisc change dev p3p2 root hhf quantum 40960 non_hh_weight 300000

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2014-05-01 09:23:06 -07:00 committed by David S. Miller
parent 39076b047b
commit f6a082fed1
1 changed files with 6 additions and 5 deletions
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11
net/sched/sch_hhf.c
View File

@ -553,11 +553,6 @@ static int hhf_change(struct Qdisc *sch, struct nlattr *opt)
if (err < 0)
return err;
sch_tree_lock(sch);
if (tb[TCA_HHF_BACKLOG_LIMIT])
sch->limit = nla_get_u32(tb[TCA_HHF_BACKLOG_LIMIT]);
if (tb[TCA_HHF_QUANTUM])
new_quantum = nla_get_u32(tb[TCA_HHF_QUANTUM]);
@ -567,6 +562,12 @@ static int hhf_change(struct Qdisc *sch, struct nlattr *opt)
non_hh_quantum = (u64)new_quantum * new_hhf_non_hh_weight;
if (non_hh_quantum > INT_MAX)
return -EINVAL;
sch_tree_lock(sch);
if (tb[TCA_HHF_BACKLOG_LIMIT])
sch->limit = nla_get_u32(tb[TCA_HHF_BACKLOG_LIMIT]);
q->quantum = new_quantum;
q->hhf_non_hh_weight = new_hhf_non_hh_weight;