[NET_SCHED]: Fix filter double free

cbq and atm destroy their filters twice when destroying inner classes
during qdisc destruction.

Reported-and-tested-by: Strobl Anton <a.strobl@aws-it.at>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index be7d299acd73..d1c383fca82c 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -599,6 +599,7 @@ static void atm_tc_destroy(struct Qdisc *sch)
         /* races ? */
         while ((flow = p->flows)) {
                 tcf_destroy_chain(flow->filter_list);
+                flow->filter_list = NULL;
                 if (flow->ref > 1)
                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
                             flow->ref);