ipmr: __pim_rcv() is called under rcu_read_lock

No need to get a reference on reg_dev and release it, we are in a
rcu_read_lock() protected section.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 10b24c0..1a92ebd 100644 (file)
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1805,6 +1805,7 @@ dont_forward:
 }
 
 #ifdef CONFIG_IP_PIMSM
+/* called with rcu_read_lock() */
 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
                     unsigned int pimlen)
 {
@@ -1826,26 +1827,23 @@ static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
        read_lock(&mrt_lock);
        if (mrt->mroute_reg_vif_num >= 0)
                reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
-       if (reg_dev)
-               dev_hold(reg_dev);
        read_unlock(&mrt_lock);
 
        if (reg_dev == NULL)
                return 1;
 
        skb->mac_header = skb->network_header;
-       skb_pull(skb, (u8*)encap - skb->data);
+       skb_pull(skb, (u8 *)encap - skb->data);
        skb_reset_network_header(skb);
        skb->protocol = htons(ETH_P_IP);
-       skb->ip_summed = 0;
+       skb->ip_summed = CHECKSUM_NONE;
        skb->pkt_type = PACKET_HOST;
 
        skb_tunnel_rx(skb, reg_dev);
 
        netif_rx(skb);
-       dev_put(reg_dev);
 
-       return 0;
+       return NET_RX_SUCCESS;
 }
 #endif