[PATCH net] net/sched: act_bpf: use rcu_dereference_bh() to read the filter

[Sechang Lim <rhkrqnwk98@gmail.com>]

tcf_bpf_act() can run from the tc egress path, which holds only
rcu_read_lock_bh(), but reads prog->filter with rcu_dereference() and
trips lockdep:

  WARNING: suspicious RCU usage
  net/sched/act_bpf.c:47 suspicious rcu_dereference_check() usage!
  1 lock held by syz.2.1588/12756:
   #0: (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit net/core/dev.c:4792
   tcf_bpf_act+0x6ae/0x940 net/sched/act_bpf.c:47
   tcf_classify+0x6e4/0x1080 net/sched/cls_api.c:1860
   sch_handle_egress net/core/dev.c:4545 [inline]
   __dev_queue_xmit+0x2185/0x2c00 net/core/dev.c:4808
   packet_sendmsg+0x3dfa/0x5120 net/packet/af_packet.c:3114

The other tc actions and cls_bpf already use rcu_dereference_bh() here.
Do the same.

Fixes: 1f211a1b929c ("net, sched: add clsact qdisc")
Signed-off-by: Sechang Lim <rhkrqnwk98@gmail.com>
---
 net/sched/act_bpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index 58a074651176..09d46e195e33 100644
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c
@@ -44,7 +44,7 @@ TC_INDIRECT_SCOPE int tcf_bpf_act(struct sk_buff *skb,
 	tcf_lastuse_update(&prog->tcf_tm);
 	bstats_update(this_cpu_ptr(prog->common.cpu_bstats), skb);
 
-	filter = rcu_dereference(prog->filter);
+	filter = rcu_dereference_bh(prog->filter);
 	if (at_ingress) {
 		__skb_push(skb, skb->mac_len);
 		filter_res = bpf_prog_run_data_pointers(filter, skb);
-- 
2.43.0