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authorEric Dumazet <edumazet@google.com>2016-06-20 15:00:43 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-07-11 09:31:11 -0700
commit6fb6914d5b459aefefafb19c57b3903ee4ad8b61 (patch)
tree4719db9ff36eb33284240be150d59729f45b5fba
parentda7da39bdf3193188bad098c90427eac5210de13 (diff)
netem: fix a use after free
[ Upstream commit 21de12ee5568fd1aec47890c72967abf791ac80a ] If the packet was dropped by lower qdisc, then we must not access it later. Save qdisc_pkt_len(skb) in a temp variable. Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/sched/sch_netem.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 4befe97a9034..b7c29d5b6f04 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -650,14 +650,14 @@ deliver:
#endif
if (q->qdisc) {
+ unsigned int pkt_len = qdisc_pkt_len(skb);
int err = qdisc_enqueue(skb, q->qdisc);
- if (unlikely(err != NET_XMIT_SUCCESS)) {
- if (net_xmit_drop_count(err)) {
- qdisc_qstats_drop(sch);
- qdisc_tree_reduce_backlog(sch, 1,
- qdisc_pkt_len(skb));
- }
+ if (err != NET_XMIT_SUCCESS &&
+ net_xmit_drop_count(err)) {
+ qdisc_qstats_drop(sch);
+ qdisc_tree_reduce_backlog(sch, 1,
+ pkt_len);
}
goto tfifo_dequeue;
}