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linux-sg2042/net/ipv6
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WANG Cong d7426c69a1 sit: fix a double free on error path 
Dmitry reported a double free in sit_init_net():

  kernel BUG at mm/percpu.c:689!
  invalid opcode: 0000 [#1] SMP KASAN
  Dumping ftrace buffer:
     (ftrace buffer empty)
  Modules linked in:
  CPU: 0 PID: 15692 Comm: syz-executor1 Not tainted 4.10.0-rc6-next-20170206 #1
  Hardware name: Google Google Compute Engine/Google Compute Engine,
  BIOS Google 01/01/2011
  task: ffff8801c9cc27c0 task.stack: ffff88017d1d8000
  RIP: 0010:pcpu_free_area+0x68b/0x810 mm/percpu.c:689
  RSP: 0018:ffff88017d1df488 EFLAGS: 00010046
  RAX: 0000000000010000 RBX: 00000000000007c0 RCX: ffffc90002829000
  RDX: 0000000000010000 RSI: ffffffff81940efb RDI: ffff8801db841d94
  RBP: ffff88017d1df590 R08: dffffc0000000000 R09: 1ffffffff0bb3bdd
  R10: dffffc0000000000 R11: 00000000000135dd R12: ffff8801db841d80
  R13: 0000000000038e40 R14: 00000000000007c0 R15: 00000000000007c0
  FS:  00007f6ea608f700(0000) GS:ffff8801dbe00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 000000002000aff8 CR3: 00000001c8d44000 CR4: 00000000001426f0
  DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
  Call Trace:
   free_percpu+0x212/0x520 mm/percpu.c:1264
   ipip6_dev_free+0x43/0x60 net/ipv6/sit.c:1335
   sit_init_net+0x3cb/0xa10 net/ipv6/sit.c:1831
   ops_init+0x10a/0x530 net/core/net_namespace.c:115
   setup_net+0x2ed/0x690 net/core/net_namespace.c:291
   copy_net_ns+0x26c/0x530 net/core/net_namespace.c:396
   create_new_namespaces+0x409/0x860 kernel/nsproxy.c:106
   unshare_nsproxy_namespaces+0xae/0x1e0 kernel/nsproxy.c:205
   SYSC_unshare kernel/fork.c:2281 [inline]
   SyS_unshare+0x64e/0xfc0 kernel/fork.c:2231
   entry_SYSCALL_64_fastpath+0x1f/0xc2

This is because when tunnel->dst_cache init fails, we free dev->tstats
once in ipip6_tunnel_init() and twice in sit_init_net(). This looks
redundant but its ndo_uinit() does not seem enough to clean up everything
here. So avoid this by setting dev->tstats to NULL after the first free,
at least for -net.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2017-02-08 13:12:22 -05:00
..
ila net: Specify the owning module for lwtunnel ops 2017-01-24 16:21:36 -05:00
netfilter netfilter: rpfilter: fix incorrect loopback packet judgment 2017-01-16 14:23:01 +01:00
Kconfig ipv6: sr: add option to control lwtunnel support 2016-11-16 11:29:46 -05:00
Makefile ipv6: sr: add option to control lwtunnel support 2016-11-16 11:29:46 -05:00
addrconf.c ipv6: addrconf: fix generation of new temporary addresses 2017-02-08 11:54:40 -05:00
addrconf_core.c
…
addrlabel.c
…
af_inet6.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ah6.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
anycast.c
…
calipso.c
…
datagram.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
esp6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-12-03 12:29:53 -05:00
exthdrs.c ipv6: sr: remove cleanup flag and fix HMAC computation 2017-02-03 11:05:23 -05:00
exthdrs_core.c
…
exthdrs_offload.c
…
fib6_rules.c
…
fou6.c
…
icmp.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
inet6_connection_sock.c tcp: don't annotate mark on control socket from tcp_v6_send_response() 2017-01-27 10:33:56 -05:00
inet6_hashtables.c inet: Fix missing return value in inet6_hash 2016-10-29 12:01:49 -04:00
ip6_checksum.c
…
ip6_fib.c
…
ip6_flowlabel.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ip6_gre.c ip6_gre: fix ip6gre_err() invalid reads 2017-02-05 17:23:04 -05:00
ip6_icmp.c
…
ip6_input.c
…
ip6_offload.c gro: Disable frag0 optimization on IPv6 ext headers 2017-01-10 21:30:33 -05:00
ip6_offload.h
…
ip6_output.c ipv6: Paritially checksum full MTU frames 2017-01-30 15:51:12 -05:00
ip6_tunnel.c ipv6: pointer math error in ip6_tnl_parse_tlv_enc_lim() 2017-02-01 12:27:33 -05:00
ip6_udp_tunnel.c ip6_udp_tunnel: remove unused IPCB related codes 2016-11-02 15:18:36 -04:00
ip6_vti.c vti6: fix device register to report IFLA_INFO_KIND 2017-01-06 16:09:09 -05:00
ip6mr.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ipcomp6.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
ipv6_sockglue.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
mcast.c mld: do not remove mld souce list info when set link down 2017-01-16 12:44:59 -05:00
mcast_snoop.c
…
mip6.c ktime: Get rid of ktime_equal() 2016-12-25 17:21:23 +01:00
ndisc.c ipv6 addrconf: Implemented enhanced DAD (RFC7527) 2016-12-03 23:21:37 -05:00
netfilter.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
output_core.c ipv6: Set skb->protocol properly for local output 2016-12-02 12:34:22 -05:00
ping.c net: inet: Support UID-based routing in IP protocols. 2016-11-04 14:45:23 -04:00
proc.c
…
protocol.c
…
raw.c ipv6: handle -EFAULT from skb_copy_bits 2016-12-23 12:20:39 -05:00
reassembly.c ipv6: on reassembly, record frag_max_size 2016-11-03 15:41:11 -04:00
route.c lwtunnel: fix autoload of lwt modules 2017-01-18 17:07:14 -05:00
seg6.c ipv6: seg6_genl_set_tunsrc() must check kmemdup() return value 2017-01-20 11:07:48 -05:00
seg6_hmac.c ipv6: sr: remove cleanup flag and fix HMAC computation 2017-02-03 11:05:23 -05:00
seg6_iptunnel.c net: Specify the owning module for lwtunnel ops 2017-01-24 16:21:36 -05:00
sit.c sit: fix a double free on error path 2017-02-08 13:12:22 -05:00
syncookies.c tcp: randomize tcp timestamp offsets for each connection 2016-12-02 12:49:59 -05:00
sysctl_net_ipv6.c
…
tcp_ipv6.c ipv6: tcp: add a missing tcp_v6_restore_cb() 2017-02-06 10:52:45 -05:00
tcpv6_offload.c
…
tunnel6.c
…
udp.c udp: properly cope with csum errors 2017-02-07 11:19:00 -05:00
udp_impl.h udplite: call proper backlog handlers 2016-11-24 15:32:14 -05:00
udp_offload.c
…
udplite.c udplite: call proper backlog handlers 2016-11-24 15:32:14 -05:00
xfrm6_input.c
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xfrm6_mode_beet.c
…
xfrm6_mode_ro.c
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xfrm6_mode_transport.c
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xfrm6_mode_tunnel.c
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xfrm6_output.c
…
xfrm6_policy.c
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xfrm6_protocol.c
…
xfrm6_state.c
…
xfrm6_tunnel.c netns: make struct pernet_operations::id unsigned int 2016-11-18 10:59:15 -05:00