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qdisc: fix a module refcount leak in qdisc_create_dflt()

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commit 166ee5b87866de07a3e56c1b757f2b5cabba72a5 upstream.

Should qdisc_alloc() fail, we must release the module refcount
we got right before.

Fixes: 6da7c8fcbcbd ("qdisc: allow setting default queuing discipline")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Eric Dumazet
2016-08-24 09:39:02 -07:00
committed by andy.padavan
parent ac3301b619
commit 1e3d7e6bb9
1 changed files with 5 additions and 4 deletions
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9
trunk/linux-3.4.x/net/sched/sch_generic.c
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@@ -582,18 +582,19 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
struct Qdisc *sch;
if (!try_module_get(ops->owner))
goto errout;
return NULL;
sch = qdisc_alloc(dev_queue, ops);
if (IS_ERR(sch))
goto errout;
if (IS_ERR(sch)) {
module_put(ops->owner);
return NULL;
}
sch->parent = parentid;
if (!ops->init || ops->init(sch, NULL) == 0)
return sch;
qdisc_destroy(sch);
errout:
return NULL;
}
EXPORT_SYMBOL(qdisc_create_dflt);