BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 8c2c8067 P4D 8c2c8067 PUD 9f12c067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10054 Comm: syz-executor.0 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff88808dde74c8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff882a51a0 RCX: ffffffff85b40c56
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88808e2bd500
RBP: ffff88808dde75c0 R08: ffff8880a66242c0 R09: ffff88808dde7648
R10: ffffed1011bbced7 R11: ffff88808dde76bf R12: ffff88808e2bd500
R13: 0000000000000001 R14: ffff88808dde7598 R15: ffffffff882a51a0
FS:  0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:00000000f7f69b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000093f08000 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
 __compat_sys_sendmsg net/compat.c:642 [inline]
 __do_compat_sys_sendmsg net/compat.c:649 [inline]
 __se_compat_sys_sendmsg net/compat.c:646 [inline]
 __ia32_compat_sys_sendmsg+0x7a/0xb0 net/compat.c:646
 do_syscall_32_irqs_on arch/x86/entry/common.c:332 [inline]
 do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:403
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f6da29
Code: b8 80 96 98 00 eb cc 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f7f690cc EFLAGS: 00000296 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000240
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000000
---[ end trace 5ef6a96fe1950956 ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff88808dde74c8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff882a51a0 RCX: ffffffff85b40c56
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88808e2bd500
RBP: ffff88808dde75c0 R08: ffff8880a66242c0 R09: ffff88808dde7648
R10: ffffed1011bbced7 R11: ffff88808dde76bf R12: ffff88808e2bd500
R13: 0000000000000001 R14: ffff88808dde7598 R15: ffffffff882a51a0
FS:  0000000000000000(0000) GS:ffff8880ae800000(0063) knlGS:00000000f7f69b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000093f08000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400