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Yang Hongyang 3705e11a21 ipv6: fix an oops when force unload ipv6 module 
When I do an ipv6 module force unload,I got the following oops:
#rmmod -f ipv6
------------[ cut here ]------------
kernel BUG at mm/slub.c:2969!
invalid opcode: 0000 [#1] SMP
last sysfs file: /sys/devices/pci0000:00/0000:00:11.0/0000:02:03.0/net/eth2/ifindex
Modules linked in: ipv6(-) dm_multipath uinput ppdev tpm_tis tpm tpm_bios pcspkr pcnet32 mii parport_pc i2c_piix4 parport i2c_core floppy mptspi mptscsih mptbase scsi_transport_spi

Pid: 2530, comm: rmmod Tainted: G  R        2.6.32 #2 440BX Desktop Reference Platform/VMware Virtual Platform
EIP: 0060:[<c04b73f2>] EFLAGS: 00010246 CPU: 0
EIP is at kfree+0x6a/0xdd
EAX: 00000000 EBX: c09e86bc ECX: c043e4dd EDX: c14293e0
ESI: e141f1d8 EDI: e140fc31 EBP: dec58ef0 ESP: dec58ed0
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process rmmod (pid: 2530, ti=dec58000 task=decb1940 task.ti=dec58000)
Stack:
 c14293e0 00000282 df624240 c0897d08 c09e86bc c09e86bc e141f1d8 dec58f1c
<0> dec58f00 e140fc31 c09e84c4 e141f1bc dec58f14 c0689d21 dec58f1c e141f1bc
<0> 00000000 dec58f2c c0689eff c09e84d8 c09e84d8 e141f1bc bff33a90 dec58f38
Call Trace:
 [<e140fc31>] ? ipv6_frags_exit_net+0x22/0x32 [ipv6]
 [<c0689d21>] ? ops_exit_list+0x19/0x3d
 [<c0689eff>] ? unregister_pernet_operations+0x2a/0x51
 [<c0689f70>] ? unregister_pernet_subsys+0x17/0x24
 [<e140fbfe>] ? ipv6_frag_exit+0x21/0x32 [ipv6]
 [<e141a361>] ? inet6_exit+0x47/0x122 [ipv6]
 [<c045f5de>] ? sys_delete_module+0x198/0x1f6
 [<c04a8acf>] ? remove_vma+0x57/0x5d
 [<c070f63f>] ? do_page_fault+0x2e7/0x315
 [<c0403218>] ? sysenter_do_call+0x12/0x28
Code: 86 00 00 00 40 c1 e8 0c c1 e0 05 01 d0 89 45 e0 66 83 38 00 79 06 8b 40 0c 89 45 e0 8b 55 e0 8b 02 84 c0 78 14 66 a9 00 c0 75 04 <0f> 0b eb fe 8b 45 e0 e8 35 15 fe ff eb 5d 8b 45 04 8b 55 e0 89
EIP: [<c04b73f2>] kfree+0x6a/0xdd SS:ESP 0068:dec58ed0
---[ end trace 4475d1a5b0afa7e5 ]---

It's because in ip6_frags_ns_sysctl_register,
"table" only alloced when "net" is not equals
to "init_net".So when we free "table" in 
ip6_frags_ns_sysctl_unregister,we should check
this first.

This patch fix the problem.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2009-12-18 20:25:13 -08:00
..
netfilter netfilter: fix crashes in bridge netfilter caused by fragment jumps 2009-12-15 16:59:59 +01:00
Kconfig
…
Makefile
…
addrconf.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-12-08 07:55:01 -08:00
addrconf_core.c
…
addrlabel.c
…
af_inet6.c net: check kern before calling security subsystem 2009-11-05 22:18:18 -08:00
ah6.c xfrm: Use the user specified truncation length in ESP and AH 2009-11-25 15:48:41 -08:00
anycast.c ipv6: use RCU to walk list of network devices 2009-11-13 20:38:49 -08:00
datagram.c ipv6: no more dev_put() in datagram_send_ctl() 2009-11-02 03:42:41 -08:00
esp6.c xfrm: Use the user specified truncation length in ESP and AH 2009-11-25 15:48:41 -08:00
exthdrs.c
…
exthdrs_core.c
…
fib6_rules.c net: Allow fib_rule_unregister to batch 2009-12-03 12:22:55 -08:00
icmp.c sysctl net: Remove unused binary sysctl code 2009-11-12 02:05:06 -08:00
inet6_connection_sock.c
…
inet6_hashtables.c tcp: Fix a connect() race with timewait sockets 2009-12-08 20:17:51 -08:00
ip6_fib.c
…
ip6_flowlabel.c net: use net_eq to compare nets 2009-11-25 15:14:13 -08:00
ip6_input.c
…
ip6_output.c
…
ip6_tunnel.c net: Simplify ip6_tunnel pernet operations. 2009-12-01 16:15:59 -08:00
ip6mr.c
…
ipcomp6.c
…
ipv6_sockglue.c
…
mcast.c ipv6: use RCU to walk list of network devices 2009-11-13 20:38:49 -08:00
mip6.c
…
ndisc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2009-12-08 07:55:01 -08:00
netfilter.c
…
proc.c
…
protocol.c
…
raw.c ipv6: avoid dev_hold()/dev_put() in rawv6_bind() 2009-11-08 00:43:18 -08:00
reassembly.c ipv6: fix an oops when force unload ipv6 module 2009-12-18 20:25:13 -08:00
route.c netns: fix net.ipv6.route.gc_min_interval_ms in netns 2009-12-18 20:11:03 -08:00
sit.c net: Simplify ipip6 aka sit pernet operations. 2009-12-01 16:15:59 -08:00
syncookies.c tcp: Revert per-route SACK/DSACK/TIMESTAMP changes. 2009-12-15 20:56:42 -08:00
sysctl_net_ipv6.c sysctl net: Remove unused binary sysctl code 2009-11-12 02:05:06 -08:00
tcp_ipv6.c tcp: Revert per-route SACK/DSACK/TIMESTAMP changes. 2009-12-15 20:56:42 -08:00
tunnel6.c
…
udp.c IPv6: use ipv6_addr_v4mapped() 2009-11-10 20:54:44 -08:00
udp_impl.h
…
udplite.c net: drop capability from protocol definitions 2009-11-05 21:40:17 -08:00
xfrm6_input.c
…
xfrm6_mode_beet.c
…
xfrm6_mode_ro.c
…
xfrm6_mode_transport.c
…
xfrm6_mode_tunnel.c
…
xfrm6_output.c
…
xfrm6_policy.c sysctl net: Remove unused binary sysctl code 2009-11-12 02:05:06 -08:00
xfrm6_state.c
…
xfrm6_tunnel.c
…