From: Eric Dumazet <edumazet@google.com>
Date: Thu, 23 Jun 2022 04:34:31 +0000 (+0000)
Subject: ip6mr: do not get a device reference in pim6_rcv()
X-Git-Tag: v6.1-rc5~731^2~295^2~18
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a24c43f54b296629774b47a0763123f3c18db9b;p=platform%2Fkernel%2Flinux-starfive.git

ip6mr: do not get a device reference in pim6_rcv()

pim6_rcv() is called under rcu_read_lock(), there is
no need to use dev_hold()/dev_put() pair.

IPv4 side was handled in commit 55747a0a73ea
("ipmr: __pim_rcv() is called under rcu_read_lock")

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index d4aad41..aa66c03 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -554,7 +554,6 @@ static int pim6_rcv(struct sk_buff *skb)
 	read_lock(&mrt_lock);
 	if (reg_vif_num >= 0)
 		reg_dev = mrt->vif_table[reg_vif_num].dev;
-	dev_hold(reg_dev);
 	read_unlock(&mrt_lock);
 
 	if (!reg_dev)
@@ -570,7 +569,6 @@ static int pim6_rcv(struct sk_buff *skb)
 
 	netif_rx(skb);
 
-	dev_put(reg_dev);
 	return 0;
  drop:
 	kfree_skb(skb);