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authorXiyu Yang <xiyuyang19@fudan.edu.cn>2020-04-15 16:36:19 +0800
committerDavid S. Miller <davem@davemloft.net>2020-04-18 13:09:46 -0700
commitd03f228470a8c0a22b774d1f8d47071e0de4f6dd (patch)
tree2b62e9da1a2a8e3346cfd2712abab732dfa4089c /net
parent2fcd80144b93ff90836a44f2054b4d82133d3a85 (diff)
downloadlinux-d03f228470a8c0a22b774d1f8d47071e0de4f6dd.tar.bz2
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@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/netrom/nr_route.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 79f12d8c7b86..0891ee02ca4f 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);