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-rw-r--r--net/packet/af_packet.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 1b7bb9d9865e..da215e5c1399 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3091,6 +3091,10 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
if (need_rehook) {
if (po->running) {
rcu_read_unlock();
+ /* prevents packet_notifier() from calling
+ * register_prot_hook()
+ */
+ po->num = 0;
__unregister_prot_hook(sk, true);
rcu_read_lock();
dev_curr = po->prot_hook.dev;
@@ -3099,6 +3103,7 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
dev->ifindex);
}
+ BUG_ON(po->running);
po->num = proto;
po->prot_hook.type = proto;