netdev - [net 1/1] tipc: eliminate potential memory leak

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Date:   Mon, 11 Dec 2017 19:11:55 +0100
From:   Jon Maloy <jon.maloy@...csson.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     <mohan.krishna.ghanta.krishnamurthy@...csson.com>,
        <tung.q.nguyen@...tech.com.au>, <hoang.h.le@...tech.com.au>,
        <jon.maloy@...csson.com>, <canh.d.luu@...tech.com.au>,
        <ying.xue@...driver.com>, <tipc-discussion@...ts.sourceforge.net>
Subject: [net  1/1] tipc: eliminate potential memory leak

In the function tipc_sk_mcast_rcv() we call refcount_dec(&skb->users)
on received sk_buffers. Since the reference counter might hit zero at
this point, we have a potential memory leak.

We fix this by replacing refcount_dec() with kfree_skb().

Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
---
 net/tipc/socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 5d18c0c..41127d0 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1140,7 +1140,7 @@ void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
 				__skb_dequeue(arrvq);
 				__skb_queue_tail(inputq, skb);
 			}
-			refcount_dec(&skb->users);
+			kfree_skb(skb);
 			spin_unlock_bh(&inputq->lock);
 			continue;
 		}
-- 
2.1.4