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| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-04-25 16:06:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-05 11:06:50 +0300 |
| commit | f0b6ce595c397a91d5b62c6b0b5ea93b84191795 (patch) | |
| tree | 498cc677ded20459318e79b1f4bebe0e81708b18 /net/x25 | |
| parent | 880e98b1abec52b23e9481312596d54dfa614bcd (diff) | |
| download | linux-f0b6ce595c397a91d5b62c6b0b5ea93b84191795.tar.xz | |
net/x25: Fix x25_neigh refcnt leak when x25 disconnect
commit 4becb7ee5b3d2829ed7b9261a245a77d5b7de902 upstream.
x25_connect() invokes x25_get_neigh(), which returns a reference of the
specified x25_neigh object to "x25->neighbour" with increased refcnt.
When x25 connect success and returns, the reference still be hold by
"x25->neighbour", so the refcount should be decreased in
x25_disconnect() to keep refcount balanced.
The reference counting issue happens in x25_disconnect(), which forgets
to decrease the refcnt increased by x25_get_neigh() in x25_connect(),
causing a refcnt leak.
Fix this issue by calling x25_neigh_put() before x25_disconnect()
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/x25')
| -rw-r--r-- | net/x25/x25_subr.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/x25/x25_subr.c b/net/x25/x25_subr.c index db0b1315d577..27c5885c14ef 100644 --- a/net/x25/x25_subr.c +++ b/net/x25/x25_subr.c @@ -363,6 +363,10 @@ void x25_disconnect(struct sock *sk, int reason, unsigned char cause, sk->sk_state_change(sk); sock_set_flag(sk, SOCK_DEAD); } + read_lock_bh(&x25_list_lock); + x25_neigh_put(x25->neighbour); + x25->neighbour = NULL; + read_unlock_bh(&x25_list_lock); } /* |