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authorJohn Fastabend <john.fastabend@gmail.com>2014-05-01 09:23:06 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-04 19:41:45 -0400
commitf6a082fed1e6407c2f4437d0d963b1bcbe5f9f58 (patch)
tree3d5ac72aa43bc61cfdbed449ed0689a74327c635 /net/sched/sch_hhf.c
parent39076b047b160821110cb4deed13424ddfdf8d00 (diff)
downloadlinux-stericsson-f6a082fed1e6407c2f4437d0d963b1bcbe5f9f58.tar.gz
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>
Diffstat (limited to 'net/sched/sch_hhf.c')
-rw-r--r--net/sched/sch_hhf.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/net/sched/sch_hhf.c b/net/sched/sch_hhf.c
index edee03d922e2..6e957c3b9854 100644
--- a/net/sched/sch_hhf.c
+++ b/net/sched/sch_hhf.c
@@ -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;