xfrm: defer daddr pointer assignment after spi parsing

xfrm: defer daddr pointer assignment after spi parsing

syzbot reports:
BUG: KASAN: use-after-free in __xfrm_state_lookup+0x695/0x6b0
Read of size 4 at addr ffff8801d434e538 by task syzkaller647520/2991
[..]
__xfrm_state_lookup+0x695/0x6b0 net/xfrm/xfrm_state.c:833
xfrm_state_lookup+0x8a/0x160 net/xfrm/xfrm_state.c:1592
xfrm_input+0x8e5/0x22f0 net/xfrm/xfrm_input.c:302

The use-after-free is the ipv4 destination address, which points
to an skb head area that has been reallocated:
  pskb_expand_head+0x36b/0x1210 net/core/skbuff.c:1494
  __pskb_pull_tail+0x14a/0x17c0 net/core/skbuff.c:1877
  pskb_may_pull include/linux/skbuff.h:2102 [inline]
  xfrm_parse_spi+0x3d3/0x4d0 net/xfrm/xfrm_input.c:170
  xfrm_input+0xce2/0x22f0 net/xfrm/xfrm_input.c:291

so the real bug is that xfrm_parse_spi() uses pskb_may_pull, but
for now do smaller workaround that makes xfrm_input fetch daddr
after spi parsing.

Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>