From: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Date: Thu, 23 Apr 2020 05:13:03 +0000 (+0800)
Subject: net/x25: Fix x25_neigh refcnt leak when receiving frame
X-Git-Tag: v4.9.221~57
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=74f971a262c76776d6cdc00288ff4f1cb93fc70e;p=platform%2Fkernel%2Flinux-amlogic.git

net/x25: Fix x25_neigh refcnt leak when receiving frame

[ Upstream commit f35d12971b4d814cdb2f659d76b42f0c545270b6 ]

x25_lapb_receive_frame() invokes x25_get_neigh(), which returns a
reference of the specified x25_neigh object to "nb" with increased
refcnt.

When x25_lapb_receive_frame() returns, local variable "nb" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one path of
x25_lapb_receive_frame(). When pskb_may_pull() returns false, the
function forgets to decrease the refcnt increased by x25_get_neigh(),
causing a refcnt leak.

Fix this issue by calling x25_neigh_put() when pskb_may_pull() returns
false.

Fixes: cb101ed2c3c7 ("x25: Handle undersized/fragmented skbs")
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/x25/x25_dev.c b/net/x25/x25_dev.c
index 39231237e1c3..30f71620d4e3 100644
--- a/net/x25/x25_dev.c
+++ b/net/x25/x25_dev.c
@@ -120,8 +120,10 @@ int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev,
 		goto drop;
 	}
 
-	if (!pskb_may_pull(skb, 1))
+	if (!pskb_may_pull(skb, 1)) {
+		x25_neigh_put(nb);
 		return 0;
+	}
 
 	switch (skb->data[0]) {