linux-kernel - [PATCH AUTOSEL 4.14 110/127] tipc: fix skb may be leaky in tipc_link

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Message-Id: <20191122055544.3299-109-sashal@kernel.org>
Date:   Fri, 22 Nov 2019 00:55:28 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hoang Le <hoang.h.le@...tech.com.au>,
        Ying Xue <ying.xue@...driver.com>,
        Jon Maloy <maloy@...jonn.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 4.14 110/127] tipc: fix skb may be leaky in tipc_link_input

From: Hoang Le <hoang.h.le@...tech.com.au>

[ Upstream commit 7384b538d3aed2ed49d3575483d17aeee790fb06 ]

When we free skb at tipc_data_input, we return a 'false' boolean.
Then, skb passed to subcalling tipc_link_input in tipc_link_rcv,

<snip>
1303 int tipc_link_rcv:
...
1354    if (!tipc_data_input(l, skb, l->inputq))
1355        rc |= tipc_link_input(l, skb, l->inputq);
</snip>

Fix it by simple changing to a 'true' boolean when skb is being free-ed.
Then, tipc_link_rcv will bypassed to subcalling tipc_link_input as above
condition.

Acked-by: Ying Xue <ying.xue@...driver.com>
Acked-by: Jon Maloy <maloy@...jonn.com>
Signed-off-by: Hoang Le <hoang.h.le@...tech.com.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/tipc/link.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 631bfc7e9127e..da749916faac4 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1073,7 +1073,7 @@ static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
 	default:
 		pr_warn("Dropping received illegal msg type\n");
 		kfree_skb(skb);
-		return false;
+		return true;
 	};
 }
 
-- 
2.20.1