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Subjectgeneral protection fault in nf_flow_table_offload_setup
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Hello,

syzbot found the following crash on:

HEAD commit: 7f013ede Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=133bfa85e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=66d8660c57ff3c98
dashboard link: https://syzkaller.appspot.com/bug?extid=e93c1d9ae19a0236289c
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=166d8faee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11aec135e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e93c1d9ae19a0236289c@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9684 Comm: syz-executor080 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_splice include/linux/list.h:408 [inline]
RIP: 0010:list_splice include/linux/list.h:424 [inline]
RIP: 0010:nf_flow_table_block_setup net/netfilter/nf_flow_table_offload.c:825 [inline]
RIP: 0010:nf_flow_table_offload_setup+0x4dc/0x6d0 net/netfilter/nf_flow_table_offload.c:882
Code: bc 24 50 ff ff ff 48 ba 00 00 00 00 00 fc ff df 4d 8b ae 00 02 00 00 4d 8b a4 24 58 ff ff ff 49 8d 7f 08 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 cd 01 00 00 4c 89 e2 49 89 47 08 48 b8 00 00 00
RSP: 0018:ffffc90002007228 EFLAGS: 00010202
RAX: ffff888091272a50 RBX: 1ffff92000400e49 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8673172e RDI: 0000000000000008
RBP: ffffc90002007370 R08: ffff888097816580 R09: fffff52000400e54
R10: fffff52000400e53 R11: ffffc9000200729e R12: ffffffff894a1188
R13: ffff888091272a50 R14: ffff888091272850 R15: 0000000000000000
FS: 0000000000ca3880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000104 CR3: 0000000092cc9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
nft_register_flowtable_net_hooks net/netfilter/nf_tables_api.c:6025 [inline]
nf_tables_newflowtable+0x1352/0x1e20 net/netfilter/nf_tables_api.c:6142
nfnetlink_rcv_batch+0xf42/0x17a0 net/netfilter/nfnetlink.c:433
nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:543 [inline]
nfnetlink_rcv+0x3e7/0x460 net/netfilter/nfnetlink.c:561
netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:672
____sys_sendmsg+0x753/0x880 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0x105/0x1d0 net/socket.c:2430
__do_sys_sendmsg net/socket.c:2439 [inline]
__se_sys_sendmsg net/socket.c:2437 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440519
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd2c0117d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440519
RDX: 0000000000000000 RSI: 0000000020003e00 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401da0
R13: 0000000000401e30 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 536c0ff4bab32d1b ]---
RIP: 0010:__list_splice include/linux/list.h:408 [inline]
RIP: 0010:list_splice include/linux/list.h:424 [inline]
RIP: 0010:nf_flow_table_block_setup net/netfilter/nf_flow_table_offload.c:825 [inline]
RIP: 0010:nf_flow_table_offload_setup+0x4dc/0x6d0 net/netfilter/nf_flow_table_offload.c:882
Code: bc 24 50 ff ff ff 48 ba 00 00 00 00 00 fc ff df 4d 8b ae 00 02 00 00 4d 8b a4 24 58 ff ff ff 49 8d 7f 08 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 cd 01 00 00 4c 89 e2 49 89 47 08 48 b8 00 00 00
RSP: 0018:ffffc90002007228 EFLAGS: 00010202
RAX: ffff888091272a50 RBX: 1ffff92000400e49 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8673172e RDI: 0000000000000008
RBP: ffffc90002007370 R08: ffff888097816580 R09: fffff52000400e54
R10: fffff52000400e53 R11: ffffc9000200729e R12: ffffffff894a1188
R13: ffff888091272a50 R14: ffff888091272850 R15: 0000000000000000
FS: 0000000000ca3880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000104 CR3: 0000000092cc9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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