4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicolas Dichtel <[email protected]>


[ Upstream commit 02a2385f37a7c6594c9d89b64c4a1451276f08eb ]

nlmsg_multicast() consumes always the skb, thus the original skb must be
freed only when this function is called with a clone.

Fixes: cb9f7a9a5c96 ("netlink: ensure to loop over all netns in 
genlmsg_multicast_allns()")
Reported-by: Ben Hutchings <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 net/netlink/genetlink.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1128,7 +1128,7 @@ static int genlmsg_mcast(struct sk_buff
        if (!err)
                delivered = true;
        else if (err != -ESRCH)
-               goto error;
+               return err;
        return delivered ? 0 : -ESRCH;
  error:
        kfree_skb(skb);


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