netlink: Improve returned error codes

Make nlmsg_trim(), nlmsg_cancel(), genlmsg_cancel(), and
nla_nest_cancel() void functions.

Return -EMSGSIZE instead of -1 if the provided message buffer is not
big enough.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 3896de79dfbf..65f01f71b3f3 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1714,7 +1714,8 @@ static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms)
         return nla_nest_end(skb, nest);
 
 nla_put_failure:
-        return nla_nest_cancel(skb, nest);
+        nla_nest_cancel(skb, nest);
+        return -EMSGSIZE;
 }
 
 static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl,