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Message-ID: <1467102608.6850.196.camel@edumazet-glaptop3.roam.corp.google.com> Date: Tue, 28 Jun 2016 10:30:08 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net> Cc: netdev <netdev@...r.kernel.org>, Dan Carpenter <dan.carpenter@...cle.com> Subject: [PATCH net-next] net_sched: netem: do not call qdisc_drop() with a NULL skb From: Eric Dumazet <edumazet@...gle.com> If skb_unshare() fails, we call qdisc_drop() with a NULL skb, which is no longer supported. Fixes: 520ac30f4551 ("net_sched: drop packets after root qdisc lock is released") Signed-off-by: Eric Dumazet <edumazet@...gle.com> Reported-by: Dan Carpenter <dan.carpenter@...cle.com> --- net/sched/sch_netem.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index ccca8ca4c722c603e8b8e6052eead51243e590b5..6eac3d8800480a4c463ae8d3b78a4fcfeec8165b 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -487,10 +487,14 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch, skb = segs; segs = segs->next; - if (!(skb = skb_unshare(skb, GFP_ATOMIC)) || - (skb->ip_summed == CHECKSUM_PARTIAL && - skb_checksum_help(skb))) { - rc = qdisc_drop(skb, sch, to_free); + skb = skb_unshare(skb, GFP_ATOMIC); + if (unlikely(!skb)) { + qdisc_qstats_drop(sch); + goto finish_segs; + } + if (skb->ip_summed == CHECKSUM_PARTIAL && + skb_checksum_help(skb)) { + qdisc_drop(skb, sch, to_free); goto finish_segs; }
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