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Message-Id: <1586939780-69791-1-git-send-email-xiyuyang19@fudan.edu.cn>
Date: Wed, 15 Apr 2020 16:36:19 +0800
From: Xiyu Yang <xiyuyang19@...an.edu.cn>
To: Ralf Baechle <ralf@...ux-mips.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, linux-hams@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: yuanxzhang@...an.edu.cn, kjlu@....edu,
Xiyu Yang <xiyuyang19@...an.edu.cn>,
Xin Tan <tanxin.ctf@...il.com>
Subject: [PATCH] net: netrom: Fix potential nr_neigh refcnt leak in nr_add_node
nr_add_node() invokes nr_neigh_get_dev(), which returns a local
reference of the nr_neigh object to "nr_neigh" with increased refcnt.
When nr_add_node() returns, "nr_neigh" becomes invalid, so the refcount
should be decreased to keep refcount balanced.
The issue happens in one normal path of nr_add_node(), which forgets to
decrease the refcnt increased by nr_neigh_get_dev() and causes a refcnt
leak. It should decrease the refcnt before the function returns like
other normal paths do.
Fix this issue by calling nr_neigh_put() before the nr_add_node()
returns.
Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
---
net/netrom/nr_route.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index d41335bad1f8..89cd9de21594 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -208,6 +208,7 @@ static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
/* refcount initialized at 1 */
spin_unlock_bh(&nr_node_list_lock);
+ nr_neigh_put(nr_neigh);
return 0;
}
nr_node_lock(nr_node);
--
2.7.4
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