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linux/net/netfilter
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Patrick McHardy ceeff7541e netfilter: nf_conntrack: fix ctnetlink related crash in nf_nat_setup_info() 
When creation of a new conntrack entry in ctnetlink fails after having
set up the NAT mappings, the conntrack has an extension area allocated
that is not getting properly destroyed when freeing the conntrack again.
This means the NAT extension is still in the bysource hash, causing a
crash when walking over the hash chain the next time:

BUG: unable to handle kernel paging request at 00120fbd
IP: [<c03d394b>] nf_nat_setup_info+0x221/0x58a
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP

Pid: 2795, comm: conntrackd Not tainted (2.6.26-rc5 #1)
EIP: 0060:[<c03d394b>] EFLAGS: 00010206 CPU: 1
EIP is at nf_nat_setup_info+0x221/0x58a
EAX: 00120fbd EBX: 00120fbd ECX: 00000001 EDX: 00000000
ESI: 0000019e EDI: e853bbb4 EBP: e853bbc8 ESP: e853bb78
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process conntrackd (pid: 2795, ti=e853a000 task=f7de10f0 task.ti=e853a000)
Stack: 00000000 e853bc2c e85672ec 00000008 c0561084 63c1db4a 00000000 00000000
       00000000 0002e109 61d2b1c3 00000000 00000000 00000000 01114e22 61d2b1c3
       00000000 00000000 f7444674 e853bc04 00000008 c038e728 0000000a f7444674
Call Trace:
 [<c038e728>] nla_parse+0x5c/0xb0
 [<c0397c1b>] ctnetlink_change_status+0x190/0x1c6
 [<c0397eec>] ctnetlink_new_conntrack+0x189/0x61f
 [<c0119aee>] update_curr+0x3d/0x52
 [<c03902d1>] nfnetlink_rcv_msg+0xc1/0xd8
 [<c0390228>] nfnetlink_rcv_msg+0x18/0xd8
 [<c0390210>] nfnetlink_rcv_msg+0x0/0xd8
 [<c038d2ce>] netlink_rcv_skb+0x2d/0x71
 [<c0390205>] nfnetlink_rcv+0x19/0x24
 [<c038d0f5>] netlink_unicast+0x1b3/0x216
 ...

Move invocation of the extension destructors to nf_conntrack_free()
to fix this problem.

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=10875

Reported-and-Tested-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-06-11 17:51:10 -07:00
..
core.c [NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS. 2008-03-26 04:39:53 +09:00
Kconfig netfilter: Kconfig: default DCCP/SCTP conntrack support to the protocol config values 2008-05-08 01:16:04 -07:00
Makefile [NETFILTER]: nf_conntrack: add DCCP protocol support 2008-04-14 11:15:49 +02:00
nf_conntrack_amanda.c [NETFILTER]: nf_conntrack: add tuplehash l3num/protonum accessors 2008-04-14 11:15:52 +02:00
nf_conntrack_core.c netfilter: nf_conntrack: fix ctnetlink related crash in nf_nat_setup_info() 2008-06-11 17:51:10 -07:00
nf_conntrack_ecache.c
nf_conntrack_expect.c netfilter: nf_conntrack_expect: fix error path unwind in nf_conntrack_expect_init() 2008-05-29 03:19:37 -07:00
nf_conntrack_extend.c [NETFILTER]: nf_conntrack_extend: warn on confirmed conntracks 2008-04-14 11:15:51 +02:00
nf_conntrack_ftp.c [NETFILTER]: nf_conntrack: add tuplehash l3num/protonum accessors 2008-04-14 11:15:52 +02:00
nf_conntrack_h323_asn1.c [NETFILTER]: nf_conntrack_h323: constify and annotate H.323 helper 2008-01-31 19:28:07 -08:00
nf_conntrack_h323_main.c [NETFILTER]: nf_conntrack: replace NF_CT_DUMP_TUPLE macro indrection by function call 2008-04-14 11:15:54 +02:00
nf_conntrack_h323_types.c [NETFILTER]: nf_conntrack_h323: constify and annotate H.323 helper 2008-01-31 19:28:07 -08:00
nf_conntrack_helper.c [NETFILTER]: annotate rest of nf_conntrack_* with const 2008-04-14 11:15:42 +02:00
nf_conntrack_irc.c [NETFILTER]: annotate rest of nf_conntrack_* with const 2008-04-14 11:15:42 +02:00
nf_conntrack_l3proto_generic.c [NETFILTER]: nf_conntrack: use bool type in struct nf_conntrack_l3proto 2008-04-14 11:15:52 +02:00
nf_conntrack_netbios_ns.c [NETFILTER]: nf_conntrack: introduce expectation classes and policies 2008-03-25 20:09:15 -07:00
nf_conntrack_netlink.c netfilter: ctnetlink: dump conntrack ID in event messages 2008-05-13 23:27:11 -07:00
nf_conntrack_pptp.c [NETFILTER]: nf_conntrack: replace NF_CT_DUMP_TUPLE macro indrection by function call 2008-04-14 11:15:54 +02:00
nf_conntrack_proto_dccp.c [NETFILTER]: nf_conntrack: use bool type in struct nf_conntrack_l4proto 2008-04-14 11:15:53 +02:00
nf_conntrack_proto_generic.c [NETFILTER]: nf_conntrack: use bool type in struct nf_conntrack_l4proto 2008-04-14 11:15:53 +02:00
nf_conntrack_proto_gre.c [NETFILTER]: nf_conntrack: replace NF_CT_DUMP_TUPLE macro indrection by function call 2008-04-14 11:15:54 +02:00
nf_conntrack_proto_sctp.c [NETFILTER]: nf_conntrack: const annotations in nf_conntrack_sctp, nf_nat_proto_gre 2008-04-14 11:15:54 +02:00
nf_conntrack_proto_tcp.c [NETFILTER]: nf_conntrack: replace NF_CT_DUMP_TUPLE macro indrection by function call 2008-04-14 11:15:54 +02:00
nf_conntrack_proto_udp.c [NETFILTER]: nf_conntrack: use bool type in struct nf_conntrack_l4proto 2008-04-14 11:15:53 +02:00
nf_conntrack_proto_udplite.c [NETFILTER]: nf_conntrack: use bool type in struct nf_conntrack_l4proto 2008-04-14 11:15:53 +02:00
nf_conntrack_proto.c [NETFILTER]: nf_conntrack: add tuplehash l3num/protonum accessors 2008-04-14 11:15:52 +02:00
nf_conntrack_sane.c [NETFILTER]: nf_conntrack: replace NF_CT_DUMP_TUPLE macro indrection by function call 2008-04-14 11:15:54 +02:00
nf_conntrack_sip.c netfilter: nf_conntrack_sip: restrict RTP expect flushing on error to last request 2008-05-08 01:15:21 -07:00
nf_conntrack_standalone.c netfilter: assign PDE->fops before gluing PDE into /proc tree 2008-05-02 04:10:57 -07:00
nf_conntrack_tftp.c [NETFILTER]: nf_conntrack: replace NF_CT_DUMP_TUPLE macro indrection by function call 2008-04-14 11:15:54 +02:00
nf_internals.h
nf_log.c netfilter: Make nflog quiet when no one listen in userspace. 2008-06-11 17:50:27 -07:00
nf_queue.c Remove duplicated unlikely() in IS_ERR() 2008-04-29 08:06:25 -07:00
nf_sockopt.c [NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS. 2008-03-26 04:39:55 +09:00
nfnetlink_log.c [NETFILTER]: Replate direct proc_fops assignment with proc_create call. 2008-03-27 16:55:53 -07:00
nfnetlink_queue.c netfilter: {nfnetlink,ip,ip6}_queue: fix skb_over_panic when enlarging packets 2008-04-29 03:16:34 -07:00
nfnetlink.c [NETNS]: Consolidate kernel netlink socket destruction. 2008-01-28 15:08:07 -08:00
x_tables.c netfilter: assign PDE->data before gluing PDE into /proc tree 2008-05-02 04:11:52 -07:00
xt_CLASSIFY.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_comment.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_connbytes.c rename div64_64 to div64_u64 2008-05-01 08:03:58 -07:00
xt_connlimit.c netfilter: xt_connlimit: fix accouning when receive RST packet in ESTABLISHED state 2008-06-04 09:57:51 -07:00
xt_connmark.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_CONNMARK.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_CONNSECMARK.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_conntrack.c [NETFILTER]: nf_conntrack: add tuplehash l3num/protonum accessors 2008-04-14 11:15:52 +02:00
xt_dccp.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_dscp.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_DSCP.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_esp.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_hashlimit.c netfilter: assign PDE->data before gluing PDE into /proc tree 2008-05-02 02:45:42 -07:00
xt_helper.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_iprange.c netfilter: xt_iprange: module aliases for xt_iprange 2008-05-13 23:27:48 -07:00
xt_length.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_limit.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_mac.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_mark.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_MARK.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_multiport.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_NFLOG.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_NFQUEUE.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_NOTRACK.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_owner.c [NETFILTER]: xt_owner: allow matching UID/GID ranges 2008-01-31 19:27:43 -08:00
xt_physdev.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_pkttype.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_policy.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_quota.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_rateest.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_RATEEST.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_realm.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_sctp.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_SECMARK.c [NETFILTER]: make secmark_tg_destroy() static 2008-02-13 17:41:39 -08:00
xt_state.c [NETFILTER]: x_tables: use %u format specifiers 2008-01-28 14:59:07 -08:00
xt_statistic.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_string.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_tcpmss.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_TCPMSS.c [NETFILTER]: xt_TCPMSS: consider reverse route's MTU in clamp-to-pmtu 2008-01-31 19:27:42 -08:00
xt_TCPOPTSTRIP.c netfilter: xt_TCPOPTSTRIP: signed tcphoff for ipv6_skip_exthdr() retval 2008-04-29 03:15:10 -07:00
xt_tcpudp.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_time.c [NETFILTER]: annotate xtables targets with const and remove casts 2008-04-14 09:56:05 +02:00
xt_TRACE.c [NETFILTER]: Update modules' descriptions 2008-01-28 15:02:26 -08:00
xt_u32.c [NETFILTER]: xt_u32: drop the actually unused variable from u32_match_it 2008-02-19 17:18:20 -08:00