[NETLINK]: Do precise netlink message allocations where possible

Account for the netlink message header size directly in nlmsg_new()
instead of relying on the caller calculate it correctly.

Replaces error handling of message construction functions when
constructing notifications with bug traps since a failure implies
a bug in calculating the size of the skb.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index f45c5e70773c..4f3f0e48c845 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -77,8 +77,7 @@ static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
         /*
          * If new attributes are added, please revisit this allocation
          */
-        size = nlmsg_total_size(genlmsg_total_size(size));
-        skb = nlmsg_new(size, GFP_KERNEL);
+        skb = nlmsg_new(genlmsg_total_size(size), GFP_KERNEL);
         if (!skb)
                 return -ENOMEM;