[PPPoE]: move lock_sock() in pppoe_sendmsg() to the right location

and the last one for now: Acquire the sock lock in pppoe_sendmsg()
before accessing the sock - and in particular avoid releasing the lock
even though it hasn't been acquired.

Signed-off-by: Florian Zumbiehl <florz@florz.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index f75aeaaf861f..35a7385ccb2a 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -774,6 +774,7 @@ static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
         struct net_device *dev;
         char *start;
 
+        lock_sock(sk);
         if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED)) {
                 error = -ENOTCONN;
                 goto end;
@@ -784,8 +785,6 @@ static int pppoe_sendmsg(struct kiocb *iocb, struct socket *sock,
         hdr.code = 0;
         hdr.sid = po->num;
 
-        lock_sock(sk);
-
         dev = po->pppoe_dev;
 
         error = -EMSGSIZE;