[patch net] net: sched: cbq: create block for q->link.block

[Jiri Pirko]

From: Jiri Pirko <j...@mellanox.com>

q->link.block is not initialized, that leads to EINVAL when one tries to
add filter there. So initialize it properly.

This can be reproduced by:

Reported-by: Jaroslav Aster <jas...@redhat.com>
Reported-by: Ivan Vecera <ivec...@redhat.com>
Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 net/sched/sch_cbq.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 6361be7..525eb3a 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1158,9 +1158,13 @@ static int cbq_init(struct Qdisc *sch, struct nlattr 
*opt)
        if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB])) == NULL)
                return -EINVAL;
 
+       err = tcf_block_get(&q->link.block, &q->link.filter_list, sch);
+       if (err)
+               goto put_rtab;
+
        err = qdisc_class_hash_init(&q->clhash);
        if (err < 0)
-               goto put_rtab;
+               goto put_block;
 
        q->link.sibling = &q->link;
        q->link.common.classid = sch->handle;
@@ -1194,6 +1198,9 @@ static int cbq_init(struct Qdisc *sch, struct nlattr *opt)
        cbq_addprio(q, &q->link);
        return 0;
 
+put_block:
+       tcf_block_put(q->link.block);
+
 put_rtab:
        qdisc_put_rtab(q->link.R_tab);
        return err;
-- 
2.9.5