[PATCH net-next] gtp: put back reference to netns when not required anymore

[Pablo Neira Ayuso]

This patch fixes a netns leak.

Fixes: 93edb8c7f94f ("gtp: reload GTPv1 header after pskb_may_pull()")
Reported-by: Cong Wang <xiyou.wangc...@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 drivers/net/gtp.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index f7caf1e..4e976a0 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1028,8 +1028,11 @@ static int gtp_genl_new_pdp(struct sk_buff *skb, struct 
genl_info *info)
 
        /* Check if there's an existing gtpX device to configure */
        dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK]));
-       if (dev == NULL)
+       if (dev == NULL) {
+               put_net(net);
                return -ENODEV;
+       }
+       put_net(net);
 
        return ipv4_pdp_add(dev, info);
 }
@@ -1051,8 +1054,11 @@ static int gtp_genl_del_pdp(struct sk_buff *skb, struct 
genl_info *info)
 
        /* Check if there's an existing gtpX device to configure */
        dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK]));
-       if (dev == NULL)
+       if (dev == NULL) {
+               put_net(net);
                return -ENODEV;
+       }
+       put_net(net);
 
        gtp = netdev_priv(dev);
 
@@ -1163,8 +1169,11 @@ static int gtp_genl_get_pdp(struct sk_buff *skb, struct 
genl_info *info)
 
        /* Check if there's an existing gtpX device to configure */
        dev = gtp_find_dev(net, nla_get_u32(info->attrs[GTPA_LINK]));
-       if (dev == NULL)
+       if (dev == NULL) {
+               put_net(net);
                return -ENODEV;
+       }
+       put_net(net);
 
        gtp = netdev_priv(dev);
 
-- 
2.1.4