From: Ying Xue <ying.xue@windriver.com>
Date: Wed, 15 Jan 2014 02:23:40 +0000 (+0800)
Subject: decnet: use __dev_get_by_index instead of dev_get_by_index to find interface
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d4c5fba2f6c272ed687fe6351e5b20bc60cf24f0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

decnet: use __dev_get_by_index instead of dev_get_by_index to find interface

The following call chain we can identify that dn_cache_getroute() is
protected under rtnl_lock. So if we use __dev_get_by_index() instead
of dev_get_by_index() to find interface handlers in it, this would help
us avoid to change interface reference counter.

rtnetlink_rcv()
  rtnl_lock()
    netlink_rcv_skb()
      dn_cache_getroute()
  rtnl_unlock()

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index ad2efa5b861b..ce0cbbfe0f43 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -1666,12 +1666,8 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 
 	if (fld.flowidn_iif) {
 		struct net_device *dev;
-		if ((dev = dev_get_by_index(&init_net, fld.flowidn_iif)) == NULL) {
-			kfree_skb(skb);
-			return -ENODEV;
-		}
-		if (!dev->dn_ptr) {
-			dev_put(dev);
+		dev = __dev_get_by_index(&init_net, fld.flowidn_iif);
+		if (!dev || !dev->dn_ptr) {
 			kfree_skb(skb);
 			return -ENODEV;
 		}
@@ -1693,8 +1689,6 @@ static int dn_cache_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 		err = dn_route_output_key((struct dst_entry **)&rt, &fld, 0);
 	}
 
-	if (skb->dev)
-		dev_put(skb->dev);
 	skb->dev = NULL;
 	if (err)
 		goto out_free;