Re: [syzbot] [bpf?] [trace?] KASAN: slab-use-after-free Read in bpf_trace_run3 (2)

[Qing Wang]

#syz test

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 2d14fb6d0ed0..038bf4436959 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -3783,6 +3783,8 @@ static void bpf_raw_tp_link_release(struct bpf_link *link)
 
        bpf_probe_unregister(raw_tp->btp, raw_tp);
        bpf_put_raw_tracepoint(raw_tp->btp);
+
+       synchronize_rcu();
 }
 
 static void bpf_raw_tp_link_dealloc(struct bpf_link *link)