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Wei Wang 76371d2e3a decnet: always not take dst->__refcnt when inserting dst into hash table 
In the existing dn_route.c code, dn_route_output_slow() takes
dst->__refcnt before calling dn_insert_route() while dn_route_input_slow()
does not take dst->__refcnt before calling dn_insert_route().
This makes the whole routing code very buggy.
In dn_dst_check_expire(), dnrt_free() is called when rt expires. This
makes the routes inserted by dn_route_output_slow() not able to be
freed as the refcnt is not released.
In dn_dst_gc(), dnrt_drop() is called to release rt which could
potentially cause the dst->__refcnt to be dropped to -1.
In dn_run_flush(), dst_free() is called to release all the dst. Again,
it makes the dst inserted by dn_route_output_slow() not able to be
released and also, it does not wait on the rcu and could potentially
cause crash in the path where other users still refer to this dst.

This patch makes sure both input and output path do not take
dst->__refcnt before calling dn_insert_route() and also makes sure
dnrt_free()/dst_free() is called when removing dst from the hash table.
The only difference between those 2 calls is that dnrt_free() waits on
the rcu while dst_free() does not.

Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 14:59:36 -04:00
..
6lowpan 6lowpan: Don't set IFF_NO_QUEUE 2017-04-12 22:02:40 +02:00
9p xen: fixes for 4.12 rc2 2017-05-19 15:06:48 -07:00
802
8021q net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
appletalk lib/vsprintf.c: remove %Z support 2017-02-27 18:43:47 -08:00
atm neighbour: fix nlmsg_pid in notifications 2017-03-22 10:48:49 -07:00
ax25 net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
batman-adv Here are two batman-adv bugfixes: 2017-06-13 13:46:01 -04:00
bluetooth net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
bpf bpf: Align packet data properly in program testing framework. 2017-05-02 11:46:28 -04:00
bridge net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
caif caif: Add sockaddr length check before accessing sa_family in connect handler 2017-06-13 16:16:11 -04:00
can can: af_can: namespace support: fix lockdep splat: properly initialize spin_lock 2017-06-09 11:39:23 +02:00
ceph libceph: cleanup old messages according to reconnect seq 2017-05-24 18:10:51 +02:00
core net: rps: fix uninitialized symbol warning 2017-06-13 11:31:22 -04:00
dcb net: rtnetlink: plumb extended ack to doit function 2017-04-17 15:35:38 -04:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-05-15 15:50:49 -07:00
decnet decnet: always not take dst->__refcnt when inserting dst into hash table 2017-06-16 14:59:36 -04:00
dns_resolver Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
dsa net: dsa: Fix stale cpu_switch reference after unbind then bind 2017-06-04 22:55:17 -04:00
ethernet Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2017-02-16 21:25:49 -05:00
hsr hsr: fix incorrect warning 2017-06-12 15:21:20 -04:00
ieee802154 net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
ife net: Introduce ife encapsulation module 2017-02-03 15:16:45 -05:00
ipv4 ip_tunnel: fix potential issue in ip_tunnel_rcv 2017-06-16 12:01:29 -04:00
ipv6 ip6_tunnel: fix potential issue in __ip6_tnl_rcv 2017-06-16 12:01:29 -04:00
ipx ipx: call ipxitf_put() in ioctl error path 2017-05-02 15:34:53 -04:00
irda net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
iucv net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
kcm kcm: remove a useless copy_from_user() 2017-04-17 13:28:48 -04:00
key af_key: Fix slab-out-of-bounds in pfkey_compile_policy. 2017-05-08 08:03:01 +02:00
l2tp l2tp: cast l2tp traffic counter to unsigned 2017-06-10 16:14:27 -04:00
l3mdev
lapb
llc net: llc: add lock_sock in llc_ui_bind to avoid a race condition 2017-05-26 14:20:29 -04:00
mac80211 Some fixes: 2017-06-13 13:34:13 -04:00
mac802154 net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
mpls mpls: fix clearing of dead nh_flags on link up 2017-05-31 14:48:24 -04:00
ncsi
netfilter netfilter: ctnetlink: fix incorrect nf_ct_put during hash resize 2017-05-24 11:26:01 +02:00
netlabel netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
netlink netlink: don't send unknown nsid 2017-06-01 11:49:39 -04:00
netrom net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
nfc NFC 4.12 pull request 2017-04-21 15:29:40 -04:00
openvswitch net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
packet net/packet: fix missing net_device reference release 2017-05-15 14:22:12 -04:00
phonet net: Fix inconsistent teardown and release of private netdev state. 2017-06-07 15:53:24 -04:00
psample net: Introduce psample, a new genetlink channel for packet sampling 2017-01-24 13:44:28 -05:00
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-04-21 20:23:53 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-05-02 16:40:27 -07:00
rfkill rfkill: remove rfkill-regulator 2017-01-24 11:07:35 +01:00
rose net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
rxrpc rxrpc: Fix several cases where a padded len isn't checked in ticket decode 2017-06-15 14:23:44 -04:00
sched net/act_pedit: fix an error code 2017-06-14 15:24:18 -04:00
sctp sctp: return next obj by passing pos + 1 into sctp_transport_get_idx 2017-06-15 14:40:30 -04:00
smc net/smc: Add warning about remote memory exposure 2017-05-16 14:49:43 -04:00
strparser strparser: destroy workqueue on module exit 2017-03-03 20:43:26 -08:00
sunrpc SUNRPC: ensure correct error is reported by xs_tcp_setup_socket() 2017-05-31 12:26:44 -04:00
switchdev netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
tipc net: tipc: Fix a sleep-in-atomic bug in tipc_msg_reverse 2017-06-10 18:20:38 -04:00
unix af_unix: Add sockaddr length checks before accessing sa_family in bind and connect handlers 2017-06-09 10:10:24 -04:00
vmw_vsock vsock: use new wait API for vsock_stream_sendmsg() 2017-05-22 14:39:36 -04:00
wimax
wireless cfg80211: make cfg80211_sched_scan_results() work from atomic context 2017-05-23 14:36:46 +02:00
x25 net: x25: fix one potential use-after-free issue 2017-05-18 10:05:40 -04:00
xfrm xfrm: fix state migration copy replay sequence numbers 2017-05-19 12:49:13 +02:00
compat.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-02-22 10:15:09 -08:00
Kconfig bpf: make jited programs visible in traces 2017-02-17 13:40:05 -05:00
Makefile bpf: introduce BPF_PROG_TEST_RUN command 2017-04-01 12:45:57 -07:00
socket.c l2tp: device MTU setup, tunnel socket needs a lock 2017-04-17 13:01:48 -04:00
sysctl_net.c sysctl: Remove dead register_sysctl_root 2017-04-16 23:42:49 -05:00