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Subject[PATCH] net: sched: drr: dont intepret cls results when asked to drop
Date
If asked to drop a packet via TC_ACT_SHOT it is unsafe to
assume that res.class contains a valid pointer.

Signed-off-by: Ma Ke <make_ruc2021@163.com>
---
net/sched/sch_drr.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 19901e77cd3b..a535dc3b0e05 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -310,6 +310,8 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
fl = rcu_dereference_bh(q->filter_list);
result = tcf_classify(skb, NULL, fl, &res, false);
if (result >= 0) {
+ if (result == TC_ACT_SHOT)
+ return NULL;
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
case TC_ACT_QUEUED:
@@ -317,8 +319,6 @@ static struct drr_class *drr_classify(struct sk_buff *skb, struct Qdisc *sch,
case TC_ACT_TRAP:
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
fallthrough;
- case TC_ACT_SHOT:
- return NULL;
}
#endif
cl = (struct drr_class *)res.class;
--
2.37.2
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