38c79e8118
see https://github.com/lxc/lxc/issues/2141 and https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407/
90 lines
3.2 KiB
Diff
90 lines
3.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Tommi Rantala <tommi.t.rantala@nokia.com>
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Date: Mon, 5 Feb 2018 21:48:14 +0200
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Subject: [PATCH] sctp: fix dst refcnt leak in sctp_v4_get_dst
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Fix dst reference count leak in sctp_v4_get_dst() introduced in commit
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410f03831 ("sctp: add routing output fallback"):
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When walking the address_list, successive ip_route_output_key() calls
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may return the same rt->dst with the reference incremented on each call.
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The code would not decrement the dst refcount when the dst pointer was
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identical from the previous iteration, causing the dst refcnt leak.
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Testcase:
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ip netns add TEST
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ip netns exec TEST ip link set lo up
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ip link add dummy0 type dummy
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ip link add dummy1 type dummy
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ip link add dummy2 type dummy
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ip link set dev dummy0 netns TEST
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ip link set dev dummy1 netns TEST
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ip link set dev dummy2 netns TEST
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ip netns exec TEST ip addr add 192.168.1.1/24 dev dummy0
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ip netns exec TEST ip link set dummy0 up
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ip netns exec TEST ip addr add 192.168.1.2/24 dev dummy1
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ip netns exec TEST ip link set dummy1 up
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ip netns exec TEST ip addr add 192.168.1.3/24 dev dummy2
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ip netns exec TEST ip link set dummy2 up
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ip netns exec TEST sctp_test -H 192.168.1.2 -P 20002 -h 192.168.1.1 -p 20000 -s -B 192.168.1.3
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ip netns del TEST
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In 4.4 and 4.9 kernels this results to:
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[ 354.179591] unregister_netdevice: waiting for lo to become free. Usage count = 1
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[ 364.419674] unregister_netdevice: waiting for lo to become free. Usage count = 1
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[ 374.663664] unregister_netdevice: waiting for lo to become free. Usage count = 1
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[ 384.903717] unregister_netdevice: waiting for lo to become free. Usage count = 1
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[ 395.143724] unregister_netdevice: waiting for lo to become free. Usage count = 1
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[ 405.383645] unregister_netdevice: waiting for lo to become free. Usage count = 1
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...
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Fixes: 410f03831 ("sctp: add routing output fallback")
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Fixes: 0ca50d12f ("sctp: fix src address selection if using secondary addresses")
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Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
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Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
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Acked-by: Neil Horman <nhorman@tuxdriver.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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net/sctp/protocol.c | 10 ++++------
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1 file changed, 4 insertions(+), 6 deletions(-)
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diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
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index 989a900383b5..e1a3ae4f3cab 100644
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--- a/net/sctp/protocol.c
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+++ b/net/sctp/protocol.c
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@@ -514,22 +514,20 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
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if (IS_ERR(rt))
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continue;
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- if (!dst)
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- dst = &rt->dst;
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-
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/* Ensure the src address belongs to the output
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* interface.
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*/
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odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
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false);
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if (!odev || odev->ifindex != fl4->flowi4_oif) {
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- if (&rt->dst != dst)
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+ if (!dst)
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+ dst = &rt->dst;
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+ else
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dst_release(&rt->dst);
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continue;
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}
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- if (dst != &rt->dst)
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- dst_release(dst);
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+ dst_release(dst);
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dst = &rt->dst;
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break;
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}
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--
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2.14.2
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