[PATCH net 6/6] gtp: add missing gtp_encap_disable_sock() in gtp_encap_enable()

[Taehee Yoo]

If an invalid role is sent from user space, gtp_encap_enable() will fail.
Then, it should call gtp_encap_disable_sock() but current code doesn't.
It makes memory leak.

Fixes: 91ed81f9abc7 ("gtp: support SGSN-side tunnels")
Signed-off-by: Taehee Yoo <ap420...@gmail.com>
---
 drivers/net/gtp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index b3ccac54e204..ecfe26215935 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -857,8 +857,13 @@ static int gtp_encap_enable(struct gtp_dev *gtp, struct 
nlattr *data[])
 
        if (data[IFLA_GTP_ROLE]) {
                role = nla_get_u32(data[IFLA_GTP_ROLE]);
-               if (role > GTP_ROLE_SGSN)
+               if (role > GTP_ROLE_SGSN) {
+                       if (sk0)
+                               gtp_encap_disable_sock(sk0);
+                       if (sk1u)
+                               gtp_encap_disable_sock(sk1u);
                        return -EINVAL;
+               }
        }
 
        gtp->sk0 = sk0;
-- 
2.17.1