ipmr: missing dev_put() on error path in vif_add()

The other error paths in front of this one have a dev_put() but this one
got missed.

Found by smatch static checker.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Wang Chen <ellre923@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 630a56df7b47..99508d66a642 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -483,8 +483,10 @@ static int vif_add(struct net *net, struct vifctl *vifc, int mrtsock)
                 return -EINVAL;
         }
 
-        if ((in_dev = __in_dev_get_rtnl(dev)) == NULL)
+        if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) {
+                dev_put(dev);
                 return -EADDRNOTAVAIL;
+        }
         IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
         ip_rt_multicast_event(in_dev);