l2tp: fix return value check

In case of error, the function genlmsg_put() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check should
be replaced with NULL test.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index d71cd9229a47a8fd85efbf3f5430c66a3e3ad5cd..6f936358d664cd3a8946317ca879180a937c8b22 100644 (file)
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -80,8 +80,8 @@ static int l2tp_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
 
        hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
                          &l2tp_nl_family, 0, L2TP_CMD_NOOP);
-       if (IS_ERR(hdr)) {
-               ret = PTR_ERR(hdr);
+       if (!hdr) {
+               ret = -EMSGSIZE;
                goto err_out;
        }
 
@@ -250,8 +250,8 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 pid, u32 seq, int flags,
 
        hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags,
                          L2TP_CMD_TUNNEL_GET);
-       if (IS_ERR(hdr))
-               return PTR_ERR(hdr);
+       if (!hdr)
+               return -EMSGSIZE;
 
        if (nla_put_u8(skb, L2TP_ATTR_PROTO_VERSION, tunnel->version) ||
            nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
@@ -617,8 +617,8 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 pid, u32 seq, int flags
        sk = tunnel->sock;
 
        hdr = genlmsg_put(skb, pid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
-       if (IS_ERR(hdr))
-               return PTR_ERR(hdr);
+       if (!hdr)
+               return -EMSGSIZE;
 
        if (nla_put_u32(skb, L2TP_ATTR_CONN_ID, tunnel->tunnel_id) ||
            nla_put_u32(skb, L2TP_ATTR_SESSION_ID, session->session_id) ||