[PATCH] net_sched: drr: check for NULL pointer in drr_dequeue
From: Bernie Harris <hidden>
Date: 2016-01-28 03:32:15
Also in:
stable
Subsystem:
networking [general], tc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jamal Hadi Salim, Jiri Pirko, Linus Torvalds
There are cases where qdisc_dequeue_peeked can return NULL, and the result is dereferenced later on in the function. Similarly to the other qdisc dequeue functions, check whether the skb pointer is NULL and if it is, goto out. Signed-off-by: Bernie Harris <redacted> --- net/sched/sch_drr.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index f26bdea..a1cd778 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c@@ -403,6 +403,8 @@ static struct sk_buff *drr_dequeue(struct Qdisc *sch) if (len <= cl->deficit) { cl->deficit -= len; skb = qdisc_dequeue_peeked(cl->qdisc); + if (unlikely(skb == NULL)) + goto out; if (cl->qdisc->q.qlen == 0) list_del(&cl->alist);
--
2.7.0