------------[ cut here ]------------
Trying to vfree() bad address (0000000000000001)
WARNING: CPU: 1 PID: 13152 at mm/vmalloc.c:2561 __vunmap+0x999/0xb70 mm/vmalloc.c:2561
Modules linked in:
CPU: 1 PID: 13152 Comm: syz-executor.4 Not tainted 5.14.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__vunmap+0x999/0xb70 mm/vmalloc.c:2561
Code: c0 31 d2 31 f6 48 c7 c7 ff ff ff ff e8 70 33 ff ff e9 fd fe ff ff e8 a6 3e c4 ff 4c 89 e6 48 c7 c7 00 cd 96 89 e8 9c 55 3a 07 <0f> 0b e9 b2 f7 ff ff 45 31 ff e9 38 ff ff ff 48 8d 45 20 48 c7 04
RSP: 0018:ffffc9000207f2d8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff815d87b5 RDI: fffff5200040fe4d
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815d25ee R11: 0000000000000000 R12: 0000000000000001
R13: fffffbfff1ad9174 R14: 0000607f4607b4f8 R15: ffffe8ffffd7b4f8
FS:  00007f1bc73ab700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3043d000 CR3: 000000003455b000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __vfree+0x3c/0xd0 mm/vmalloc.c:2635
 vfree+0x5a/0x90 mm/vmalloc.c:2666
 ipcomp_free_scratches+0xc4/0x160 net/xfrm/xfrm_ipcomp.c:203
 ipcomp_free_data net/xfrm/xfrm_ipcomp.c:312 [inline]
 ipcomp_init_state+0x77c/0xa40 net/xfrm/xfrm_ipcomp.c:364
 ipcomp6_init_state+0xc2/0x700 net/ipv6/ipcomp6.c:154
 __xfrm_init_state+0x995/0x15c0 net/xfrm/xfrm_state.c:2648
 xfrm_state_construct net/xfrm/xfrm_user.c:627 [inline]
 xfrm_add_sa+0x1ef1/0x35f0 net/xfrm/xfrm_user.c:684
 xfrm_user_rcv_msg+0x430/0xa20 net/xfrm/xfrm_user.c:2812
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2834
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1bc73ab188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000005
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffed2185a3f R14: 00007f1bc73ab300 R15: 0000000000022000
----------------
Code disassembly (best guess):
   0:	c0 31 d2             	shlb   $0xd2,(%rcx)
   3:	31 f6                	xor    %esi,%esi
   5:	48 c7 c7 ff ff ff ff 	mov    $0xffffffffffffffff,%rdi
   c:	e8 70 33 ff ff       	callq  0xffff3381
  11:	e9 fd fe ff ff       	jmpq   0xffffff13
  16:	e8 a6 3e c4 ff       	callq  0xffc43ec1
  1b:	4c 89 e6             	mov    %r12,%rsi
  1e:	48 c7 c7 00 cd 96 89 	mov    $0xffffffff8996cd00,%rdi
  25:	e8 9c 55 3a 07       	callq  0x73a55c6
  2a:	0f 0b                	ud2     <-- trapping instruction
  2c:	e9 b2 f7 ff ff       	jmpq   0xfffff7e3
  31:	45 31 ff             	xor    %r15d,%r15d
  34:	e9 38 ff ff ff       	jmpq   0xffffff71
  39:	48 8d 45 20          	lea    0x20(%rbp),%rax
  3d:	48                   	rex.W
  3e:	c7                   	.byte 0xc7
  3f:	04                   	.byte 0x4