flow_dissector: Fix potential use-after-free on BPF_PROG_DETACH

[linux.git] / net / core / flow_dissector.c

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 3e6fedb57bc100e8ce002deddbade59371a73065..2470b4b404e62e625b17714f27fa7aba58eef9c5 100644 (file)
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -142,8 +142,8 @@ int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
                mutex_unlock(&flow_dissector_mutex);
                return -ENOENT;
        }
-       bpf_prog_put(attached);
        RCU_INIT_POINTER(net->flow_dissector_prog, NULL);
+       bpf_prog_put(attached);
        mutex_unlock(&flow_dissector_mutex);
        return 0;
 }