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Francesco Ruggeri acbb219d5f net: ipv4: ipmr_expire_timer causes crash when removing net namespace 
When tearing down a net namespace, ipv4 mr_table structures are freed
without first deactivating their timers. This can result in a crash in
run_timer_softirq.
This patch mimics the corresponding behaviour in ipv6.
Locking and synchronization seem to be adequate.
We are about to kfree mrt, so existing code should already make sure that
no other references to mrt are pending or can be created by incoming traffic.
The functions invoked here do not cause new references to mrt or other
race conditions to be created.
Invoking del_timer_sync guarantees that ipmr_expire_timer is inactive.
Both ipmr_expire_process (whose completion we may have to wait in
del_timer_sync) and mroute_clean_tables internally use mfc_unres_lock
or other synchronizations when needed, and they both only modify mrt.

Tested in Linux 3.4.8.

Signed-off-by: Francesco Ruggeri <fruggeri@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-08-30 12:51:32 -04:00
..
9p net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
802
8021q vlan: clean up vlan_dev_hard_start_xmit() 2012-08-14 14:33:32 -07:00
appletalk net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
atm atm: fix info leak via getsockname() 2012-08-15 21:36:30 -07:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-07-19 11:17:30 -07:00
batman-adv batman-adv: Fix mem leak in the batadv_tt_local_event() function 2012-08-08 16:04:04 -07:00
bluetooth Bluetooth: L2CAP - Fix info leak via getsockname() 2012-08-15 21:36:31 -07:00
bridge bridge: fix rcu dereference outside of rcu_read_lock 2012-08-15 15:09:41 -07:00
caif caif: Do not dereference NULL in chnl_recv_cb() 2012-08-20 02:47:49 -07:00
can can: gw: Remove pointless casts 2012-07-10 22:36:17 +02:00
ceph libceph: avoid truncation due to racing banners 2012-08-21 15:55:27 -07:00
core netpoll: revert 6bdb7fe310 and fix be_poll() instead 2012-08-29 15:03:23 -04:00
dcb net: Fix non-kernel-doc comments with kernel-doc start marker 2012-07-10 23:13:45 -07:00
dccp dccp: fix info leak via getsockopt(DCCP_SOCKOPT_CCID_TX_INFO) 2012-08-15 21:36:31 -07:00
decnet ipv4: Restore old dst_free() behavior. 2012-07-31 14:41:38 -07:00
dns_resolver
dsa
ethernet ipx: move peII functions 2012-07-19 10:48:00 -07:00
ieee802154 6lowpan: Change byte order when storing/accessing to len field 2012-07-16 22:52:02 -07:00
ipv4 net: ipv4: ipmr_expire_timer causes crash when removing net namespace 2012-08-30 12:51:32 -04:00
ipv6 net: tcp: move sk_rx_dst_set call after tcp_create_openreq_child() 2012-08-20 03:03:33 -07:00
ipx ipx: move peII functions 2012-07-19 10:48:00 -07:00
irda irda: Fix typo in irda 2012-07-16 23:23:52 -07:00
iucv
key
l2tp l2tp: avoid to use synchronize_rcu in tunnel free function 2012-08-30 12:31:03 -04:00
lapb
llc llc: fix info leak via getsockname() 2012-08-15 21:36:31 -07:00
mac80211 Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211 2012-08-23 09:51:15 -04:00
mac802154 mac802154: sparse warnings: make symbols static 2012-07-12 07:54:45 -07:00
netfilter Merge git://1984.lsi.us.es/nf 2012-08-20 02:44:29 -07:00
netlabel
netlink netlink: fix possible spoofing from non-root processes 2012-08-24 13:36:09 -04:00
netrom
nfc Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem 2012-07-20 12:30:48 -04:00
openvswitch Revert "openvswitch: potential NULL deref in sample()" 2012-07-27 13:45:51 -07:00
packet af_packet: match_fanout_group() can be static 2012-08-23 09:27:12 -07:00
phonet
rds rds: set correct msg_namelen 2012-07-23 01:01:44 -07:00
rfkill
rose
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-07-10 23:56:33 -07:00
sched act_mirred: do not drop packets when fails to mirror it 2012-08-16 14:54:44 -07:00
sctp netvm: prevent a stream-specific deadlock 2012-07-31 18:42:47 -07:00
sunrpc Merge branch 'akpm' (Andrew's patch-bomb) 2012-07-31 19:25:39 -07:00
tipc tipc: remove print_buf and deprecated log buffer code 2012-07-13 19:34:43 -04:00
unix af_netlink: force credentials passing [CVE-2012-3520] 2012-08-21 14:53:01 -07:00
wanrouter wanmain: comparing array with NULL 2012-07-24 13:55:21 -07:00
wimax
wireless cfg80211: process pending events when unregistering net device 2012-08-06 14:29:58 -04:00
x25 net: Fix (nearly-)kernel-doc comments for various functions 2012-07-10 23:13:45 -07:00
xfrm net: ipv6: fix oops in inet_putpeer() 2012-08-20 02:56:56 -07:00
compat.c net: Fix references to out-of-scope variables in put_cmsg_compat() 2012-07-22 17:50:49 -07:00
Kconfig
Makefile
nonet.c
socket.c net: fix info leak in compat dev_ifconf() 2012-08-15 21:36:31 -07:00
sysctl_net.c