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linux/net/ipv4/netfilter
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Evgeniy Polyakov 1f305323ff [NETFILTER]: Fix kernel panic with REDIRECT target. 
When connection tracking entry (nf_conn) is about to copy itself it can
have some of its extension users (like nat) as being already freed and
thus not required to be copied.

Actually looking at this function I suspect it was copied from
nf_nat_setup_info() and thus bug was introduced.

Report and testing from David <david@unsolicited.net>.

[ Patrick McHardy states:

	I now understand whats happening:

	- new connection is allocated without helper
	- connection is REDIRECTed to localhost
	- nf_nat_setup_info adds NAT extension, but doesn't initialize it yet
	- nf_conntrack_alter_reply performs a helper lookup based on the
	   new tuple, finds the SIP helper and allocates a helper extension,
	   causing reallocation because of too little space
	- nf_nat_move_storage is called with the uninitialized nat extension

	So your fix is entirely correct, thanks a lot :)  ]

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-11-20 04:27:35 -08:00
..
arp_tables.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
arpt_mangle.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
arptable_filter.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ip_queue.c [NETFILTER]: ip{,6}_queue: convert to seq_file interface 2007-11-07 04:08:20 -08:00
ip_tables.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_addrtype.c [NETFILTER]: x_tables: mark matches and targets __read_mostly 2007-07-10 22:17:15 -07:00
ipt_ah.c [NETFILTER]: x_tables: mark matches and targets __read_mostly 2007-07-10 22:17:15 -07:00
ipt_CLUSTERIP.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_ECN.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_ecn.c [NETFILTER]: x_tables: mark matches and targets __read_mostly 2007-07-10 22:17:15 -07:00
ipt_iprange.c [NETFILTER]: Convert DEBUGP to pr_debug 2007-07-10 22:18:20 -07:00
ipt_LOG.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_MASQUERADE.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_NETMAP.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_owner.c [NETFILTER]: x_tables: mark matches and targets __read_mostly 2007-07-10 22:17:15 -07:00
ipt_recent.c [NETFILTER]: Make netfilter code use the seq_open_private 2007-10-10 16:55:34 -07:00
ipt_REDIRECT.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_REJECT.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_SAME.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_tos.c [NETFILTER]: x_tables: mark matches and targets __read_mostly 2007-07-10 22:17:15 -07:00
ipt_TOS.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_TTL.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
ipt_ttl.c [NETFILTER]: x_tables: mark matches and targets __read_mostly 2007-07-10 22:17:15 -07:00
ipt_ULOG.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
iptable_filter.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
iptable_mangle.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
iptable_raw.c [IPV4]: Add missing "space" 2007-11-19 23:46:29 -08:00
Kconfig Kbuild/doc: fix links to Documentation files 2007-10-30 14:26:30 -07:00
Makefile [NETFILTER]: Clean up Makefile 2007-11-07 04:08:22 -08:00
nf_conntrack_l3proto_ipv4.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_conntrack_l3proto_ipv4_compat.c [NETFILTER]: Make netfilter code use the seq_open_private 2007-10-10 16:55:34 -07:00
nf_conntrack_proto_icmp.c sysctl: remove broken netfilter binary sysctls 2007-10-18 14:37:23 -07:00
nf_nat_amanda.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_core.c [NETFILTER]: Fix kernel panic with REDIRECT target. 2007-11-20 04:27:35 -08:00
nf_nat_ftp.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_h323.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_helper.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_irc.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_pptp.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_proto_gre.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_proto_icmp.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_proto_tcp.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_proto_udp.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_proto_unknown.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_rule.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_sip.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_snmp_basic.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_standalone.c [NETFILTER]: Replace sk_buff ** with sk_buff * 2007-10-15 12:26:29 -07:00
nf_nat_tftp.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00