netdev - [net] Revert "net:tipc: Fix a double free in tipc_sk_mcast

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Date:   Fri, 14 May 2021 08:23:03 +0700
From:   Hoang Le <hoang.h.le@...tech.com.au>
To:     jmaloy@...hat.com, maloy@...jonn.com, ying.xue@...driver.com,
        kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net
Cc:     Tung Nguyen <tung.q.nguyen@...tech.com.au>
Subject: [net] Revert "net:tipc: Fix a double free in tipc_sk_mcast_rcv"

This reverts commit 6bf24dc0cc0cc43b29ba344b66d78590e687e046.
Above fix is not correct and caused memory leak issue.

Fixes: 6bf24dc0cc0c ("net:tipc: Fix a double free in tipc_sk_mcast_rcv")
Acked-by: Jon Maloy <jmaloy@...hat.com>
Acked-by: Tung Nguyen <tung.q.nguyen@...tech.com.au>
Signed-off-by: Hoang Le <hoang.h.le@...tech.com.au>
---
 net/tipc/socket.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 58935cd0d068..53af72824c9c 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1262,7 +1262,10 @@ void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
 		spin_lock_bh(&inputq->lock);
 		if (skb_peek(arrvq) == skb) {
 			skb_queue_splice_tail_init(&tmpq, inputq);
-			__skb_dequeue(arrvq);
+			/* Decrease the skb's refcnt as increasing in the
+			 * function tipc_skb_peek
+			 */
+			kfree_skb(__skb_dequeue(arrvq));
 		}
 		spin_unlock_bh(&inputq->lock);
 		__skb_queue_purge(&tmpq);
-- 
2.25.1