linux/net/xfrm
Alexey Kodanev 1625f45299 net/xfrm_input: fix possible NULL deref of tunnel.ip6->parms.i_key
Running LTP 'icmp-uni-basic.sh -6 -p ipcomp -m tunnel' test over
openvswitch + veth can trigger kernel panic:

  BUG: unable to handle kernel NULL pointer dereference
  at 00000000000000e0 IP: [<ffffffff8169d1d2>] xfrm_input+0x82/0x750
  ...
  [<ffffffff816d472e>] xfrm6_rcv_spi+0x1e/0x20
  [<ffffffffa082c3c2>] xfrm6_tunnel_rcv+0x42/0x50 [xfrm6_tunnel]
  [<ffffffffa082727e>] tunnel6_rcv+0x3e/0x8c [tunnel6]
  [<ffffffff8169f365>] ip6_input_finish+0xd5/0x430
  [<ffffffff8169fc53>] ip6_input+0x33/0x90
  [<ffffffff8169f1d5>] ip6_rcv_finish+0xa5/0xb0
  ...

It seems that tunnel.ip6 can have garbage values and also dereferenced
without a proper check, only tunnel.ip4 is being verified. Fix it by
adding one more if block for AF_INET6 and initialize tunnel.ip6 with NULL
inside xfrm6_rcv_spi() (which is similar to xfrm4_rcv_spi()).

Fixes: 049f8e2 ("xfrm: Override skb->mark with tunnel->parm.i_key in xfrm_input")

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2016-08-11 13:15:57 +02:00
..
Kconfig
Makefile
xfrm_algo.c
xfrm_hash.c
xfrm_hash.h
xfrm_input.c net/xfrm_input: fix possible NULL deref of tunnel.ip6->parms.i_key 2016-08-11 13:15:57 +02:00
xfrm_ipcomp.c
xfrm_output.c
xfrm_policy.c xfrm: Ignore socket policies when rebuilding hash tables 2016-07-29 10:21:54 +02:00
xfrm_proc.c
xfrm_replay.c
xfrm_state.c
xfrm_sysctl.c
xfrm_user.c xfrm: get rid of another incorrect WARN 2016-07-27 13:09:00 +02:00