netpoll: zap_completion_queue: adjust skb->users counter

[Chris Wright]

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

From: Jarek Poplawski <jarkao2@xxxxxxxxx>

Upstream commit: 8a455b087c9629b3ae3b521b4f1ed16672f978cc

zap_completion_queue() retrieves skbs from completion_queue where they have
zero skb->users counter.  Before dev_kfree_skb_any() it should be non-zero
yet, so it's increased now.

Reported-and-tested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jarek Poplawski <jarkao2@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 net/core/netpoll.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -219,10 +219,12 @@ static void zap_completion_queue(void)
 		while (clist != NULL) {
 			struct sk_buff *skb = clist;
 			clist = clist->next;
-			if (skb->destructor)
+			if (skb->destructor) {
+				atomic_inc(&skb->users);
 				dev_kfree_skb_any(skb); /* put this one back */
-			else
+			} else {
 				__kfree_skb(skb);
+			}
 		}
 	}
 

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