BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD a3a47067 P4D a3a47067 PUD 836cc067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8892 Comm: syz-executor.0 Not tainted 5.3.0-rc6-next-20190830 #75
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8880a399f4d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff884a25a0 RCX: ffffffff85b92086
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880a86d8000
RBP: ffff8880a399f5d0 R08: ffff888091fa4280 R09: ffff8880a399f658
R10: ffffed1014733ed9 R11: ffff8880a399f6cf R12: ffff8880a86d8000
R13: 0000000000000001 R14: ffff8880a399f5a8 R15: ffffffff884a25a0
FS:  00007ffa12ea4700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a7505000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tc_bind_tclass+0x13e/0x2f0 net/sched/sch_api.c:1923
 tc_ctl_tclass+0xadb/0xcd0 net/sched/sch_api.c:2059
 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:5223
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5241
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x8a5/0xd60 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:637 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:657
 ___sys_sendmsg+0x803/0x920 net/socket.c:2311
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2356
 __do_sys_sendmsg net/socket.c:2365 [inline]
 __se_sys_sendmsg net/socket.c:2363 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2363
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4598e9
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffa12ea3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffa12ea46d4
R13: 00000000004c77fb R14: 00000000004dd098 R15: 00000000ffffffff
Modules linked in:
CR2: 0000000000000000
---[ end trace 3b6b899b539be7e7 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8880a399f4d8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff884a25a0 RCX: ffffffff85b92086
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880a86d8000
RBP: ffff8880a399f5d0 R08: ffff888091fa4280 R09: ffff8880a399f658
R10: ffffed1014733ed9 R11: ffff8880a399f6cf R12: ffff8880a86d8000
R13: 0000000000000001 R14: ffff8880a399f5a8 R15: ffffffff884a25a0
FS:  00007ffa12ea4700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000000a7505000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400