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[PATCH 4.6 02/31] act_ipt: fix a bind refcnt leak

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4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: WANG Cong <xiyou.wangcong@gmail.com>

[ Upstream commit d15eccea69b96a5116169688dcc9baf6d1ce2751 ]

And avoid calling tcf_hash_check() twice.

Fixes: a57f19d30b2d ("net sched: ipt action fix late binding")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sched/act_ipt.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/sched/act_ipt.c
+++ b/net/sched/act_ipt.c
@@ -121,10 +121,13 @@ static int __tcf_ipt_init(struct tc_acti
 	}
 
 	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
-	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
+	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
+		if (exists)
+			tcf_hash_release(a, bind);
 		return -EINVAL;
+	}
 
-	if (!tcf_hash_check(tn, index, a, bind)) {
+	if (!exists) {
 		ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind,
 				      false);
 		if (ret)

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[PATCH 4.6 00/31] 4.6.4-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 11/31] bpf, perf: delay release of BPF prog after grace period Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 20/31] usb: musb: only restore devctl when session was set in backup Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 03/31] net: Dont forget pr_fmt on net_dbg_ratelimited for CONFIG_DYNAMIC_DEBUG Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:20 +0200
  [PATCH 4.6 05/31] kcm: fix /proc memory leak Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 07/31] netem: fix a use after free Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 08/31] ipmr/ip6mr: Initialize the last assert time of mfc entries. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 04/31] sit: correct IP protocol used in ipip6_err Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:30 +0200
  [PATCH 4.6 25/31] usb: xhci-plat: properly handle probe deferral for devm_clk_get() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 01/31] net_sched: fix pfifo_head_drop behavior vs backlog Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 23/31] usb: musb: host: correct cppi dma channel for isoch transfer Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 10/31] sock_diag: do not broadcast raw socket destruction Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 18/31] usb: quirks: Fix sorting Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 27/31] xhci: Fix handling timeouted commands on hosts in weird states. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 16/31] crypto: user - re-add size check for CRYPTO_MSG_GETALG Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 30/31] usb: host: ehci-tegra: Grab the correct UTMI pads reset Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 19/31] usb: quirks: Add no-lpm quirk for Acer C120 LED Projector Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 21/31] usb: musb: Stop bulk endpoint while queue is rotated Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 14/31] crypto: vmx - Increase priority of aes-cbc cipher Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 26/31] USB: xhci: Add broken streams quirk for Frescologic device id 1009 Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 02/31] act_ipt: fix a bind refcnt leak Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 31/31] usb: dwc3: exynos: Fix deferred probing storm. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 17/31] USB: uas: Fix slave queue_depth not being set Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 13/31] AX.25: Close socket connection on session completion Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 12/31] neigh: Explicitly declare RCU-bh read side critical section in neigh_xmit() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 28/31] USB: mos7720: delete parport Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 15/31] crypto: ux500 - memmove the right size Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  [PATCH 4.6 22/31] usb: musb: Ensure rx reinit occurs for shared_fifo endpoints Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 03:40 +0200
  Re: [PATCH 4.6 00/31] 4.6.4-stable review Heinz Diehl <htd+ml@fritha.org> - 2016-07-07 14:50 +0200
    Re: [PATCH 4.6 00/31] 4.6.4-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-07 21:20 +0200
  Re: [PATCH 4.6 00/31] 4.6.4-stable review Guenter Roeck <linux@roeck-us.net> - 2016-07-07 15:40 +0200
  Re: [PATCH 4.6 00/31] 4.6.4-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2016-07-08 05:50 +0200
    Re: [PATCH 4.6 00/31] 4.6.4-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-07-09 07:20 +0200

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