[PATCH 4.4 24/36] netlink: ensure to loop over all netns in genlmsg_multicast_allns()

[Greg Kroah-Hartman]

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

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

From: Nicolas Dichtel <nicolas.dich...@6wind.com>


[ Upstream commit cb9f7a9a5c96a773bbc9c70660dc600cfff82f82 ]

Nowadays, nlmsg_multicast() returns only 0 or -ESRCH but this was not the
case when commit 134e63756d5f was pushed.
However, there was no reason to stop the loop if a netns does not have
listeners.
Returns -ESRCH only if there was no listeners in all netns.

To avoid having the same problem in the future, I didn't take the
assumption that nlmsg_multicast() returns only 0 or -ESRCH.

Fixes: 134e63756d5f ("genetlink: make netns aware")
CC: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/netlink/genetlink.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -1118,6 +1118,7 @@ static int genlmsg_mcast(struct sk_buff
 {
        struct sk_buff *tmp;
        struct net *net, *prev = NULL;
+       bool delivered = false;
        int err;
 
        for_each_net_rcu(net) {
@@ -1129,14 +1130,21 @@ static int genlmsg_mcast(struct sk_buff
                        }
                        err = nlmsg_multicast(prev->genl_sock, tmp,
                                              portid, group, flags);
-                       if (err)
+                       if (!err)
+                               delivered = true;
+                       else if (err != -ESRCH)
                                goto error;
                }
 
                prev = net;
        }
 
-       return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags);
+       err = nlmsg_multicast(prev->genl_sock, skb, portid, group, flags);
+       if (!err)
+               delivered = true;
+       else if (err != -ESRCH)
+               goto error;
+       return delivered ? 0 : -ESRCH;
  error:
        kfree_skb(skb);
        return err;