net: Prevent invalid access to skb->prev in __qdisc_drop_all

[mirror_ubuntu-bionic-kernel.git] / net / sched / act_mirred.c

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 8b3e593884803370ea27ef5fe770fa5ae829a888..08b61849c2a2f448fa0a29b0c93037ebbbafd0e7 100644 (file)
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -239,7 +239,7 @@ static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
        struct tcf_t *tm = &m->tcf_tm;
 
        _bstats_cpu_update(this_cpu_ptr(a->cpu_bstats), bytes, packets);
-       tm->lastuse = lastuse;
+       tm->lastuse = max_t(u64, tm->lastuse, lastuse);
 }
 
 static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind,