[PATCH net] sch_sfq: fix null pointer dereference at timer expiration

[Paolo Abeni]

While converting sch_sfq to use timer_setup(), the commit cdeabbb88134
("net: sched: Convert timers to use timer_setup()") forgot to
initialize the 'sch' field. As a result, the timer callback tries to
dereference a NULL pointer, and the kernel does oops.

Fix it initializing such field at qdisc creation time.

Fixes: cdeabbb88134 ("net: sched: Convert timers to use timer_setup()")
Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
 net/sched/sch_sfq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 890f4a4564e7..09c1203c1711 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -724,6 +724,7 @@ static int sfq_init(struct Qdisc *sch, struct nlattr *opt)
        int i;
        int err;
 
+       q->sch = sch;
        timer_setup(&q->perturb_timer, sfq_perturbation, TIMER_DEFERRABLE);
 
        err = tcf_block_get(&q->block, &q->filter_list, sch);
-- 
2.13.6