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Xin Long f6a23d85d0 xfrm: fix a NULL-ptr deref in xfrm_local_error 
This patch is to fix a crash:

  [ ] kasan: GPF could be caused by NULL-ptr deref or user memory access
  [ ] general protection fault: 0000 [#1] SMP KASAN PTI
  [ ] RIP: 0010:ipv6_local_error+0xac/0x7a0
  [ ] Call Trace:
  [ ]  xfrm6_local_error+0x1eb/0x300
  [ ]  xfrm_local_error+0x95/0x130
  [ ]  __xfrm6_output+0x65f/0xb50
  [ ]  xfrm6_output+0x106/0x46f
  [ ]  udp_tunnel6_xmit_skb+0x618/0xbf0 [ip6_udp_tunnel]
  [ ]  vxlan_xmit_one+0xbc6/0x2c60 [vxlan]
  [ ]  vxlan_xmit+0x6a0/0x4276 [vxlan]
  [ ]  dev_hard_start_xmit+0x165/0x820
  [ ]  __dev_queue_xmit+0x1ff0/0x2b90
  [ ]  ip_finish_output2+0xd3e/0x1480
  [ ]  ip_do_fragment+0x182d/0x2210
  [ ]  ip_output+0x1d0/0x510
  [ ]  ip_send_skb+0x37/0xa0
  [ ]  raw_sendmsg+0x1b4c/0x2b80
  [ ]  sock_sendmsg+0xc0/0x110

This occurred when sending a v4 skb over vxlan6 over ipsec, in which case
skb->protocol == htons(ETH_P_IPV6) while skb->sk->sk_family == AF_INET in
xfrm_local_error(). Then it will go to xfrm6_local_error() where it tries
to get ipv6 info from a ipv4 sk.

This issue was actually fixed by Commit 628e341f31 ("xfrm: make local
error reporting more robust"), but brought back by Commit 844d48746e
("xfrm: choose protocol family by skb protocol").

So to fix it, we should call xfrm6_local_error() only when skb->protocol
is htons(ETH_P_IPV6) and skb->sk->sk_family is AF_INET6.

Fixes: 844d48746e ("xfrm: choose protocol family by skb protocol")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
 		2020-05-29 12:10:22 +02:00
..
Kconfig Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2019-11-25 20:02:57 -08:00
Makefile xfrm: add espintcp (RFC 8229) 2019-12-09 09:59:07 +01:00
espintcp.c xfrm: espintcp: save and call old ->sk_destruct 2020-04-20 07:34:16 +02:00
xfrm_algo.c crypto: skcipher - remove the "blkcipher" algorithm type 2019-11-01 13:38:32 +08:00
xfrm_device.c xfrm: do pskb_pull properly in __xfrm_transport_prep 2020-04-15 09:50:03 +02:00
xfrm_hash.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
xfrm_hash.h xfrm: use complete IPv6 addresses for hash 2018-10-15 10:09:18 +02:00
xfrm_inout.h xfrm: remove input2 indirection from xfrm_mode 2019-04-08 09:14:55 +02:00
xfrm_input.c xfrm: allow to accept packets with ipv6 NEXTHDR_HOP in xfrm_input 2020-04-15 09:50:03 +02:00
xfrm_interface.c xfrm interface: fix oops when deleting a x-netns interface 2020-04-23 08:09:39 +02:00
xfrm_ipcomp.c net: Use skb_frag_off accessors 2019-07-30 14:21:32 -07:00
xfrm_output.c xfrm: fix a NULL-ptr deref in xfrm_local_error 2020-05-29 12:10:22 +02:00
xfrm_policy.c xfrm: fix a warning in xfrm_policy_insert_list 2020-05-25 16:04:12 +02:00
xfrm_proc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
xfrm_replay.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
xfrm_state.c xfrm: Use kmem_cache_zalloc() instead of kmem_cache_alloc() with flag GFP_ZERO. 2020-02-19 09:33:56 +01:00
xfrm_sysctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm_user.c xfrm: add the missing verify_sec_ctx_len check in xfrm_add_acquire 2020-02-12 11:06:32 +01:00