general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 PID: 14340 Comm: syz-executor.4 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:tcf_dump_walker net/sched/act_api.c:240 [inline] RIP: 0010:tcf_generic_walker+0x367/0xba0 net/sched/act_api.c:343 Code: 24 31 ff 48 89 de e8 c8 55 eb fa 48 85 db 74 3f e8 3e 59 eb fa 48 8d 7d 30 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 26 07 00 00 48 8b 5d 30 31 ff 48 2b 1c 24 48 89 RSP: 0018:ffffc9001651f268 EFLAGS: 00010202 RAX: 0000000000000004 RBX: c00000010001eff3 RCX: dffffc0000000000 RDX: 0000000000040000 RSI: ffffffff868ae502 RDI: 0000000000000020 RBP: fffffffffffffff0 R08: 0000000000000000 R09: ffff88808df79c07 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880935f3700 R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000000 FS: 00007f4d14258700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000051f320 CR3: 0000000050ed0000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tc_dump_action+0x6d5/0xe60 net/sched/act_api.c:1609 netlink_dump+0x4cd/0xf60 net/netlink/af_netlink.c:2246 __netlink_dump_start+0x643/0x900 net/netlink/af_netlink.c:2354 netlink_dump_start include/linux/netlink.h:246 [inline] rtnetlink_rcv_msg+0x70f/0xad0 net/core/rtnetlink.c:5526 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x331/0x810 net/socket.c:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmmsg+0x195/0x480 net/socket.c:2497 __do_sys_sendmmsg net/socket.c:2526 [inline] __se_sys_sendmmsg net/socket.c:2523 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2523 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4d14257c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000027f40 RCX: 000000000045dd99 RDX: 0492492492492805 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 000000000118bf68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fff088583df R14: 00007f4d142589c0 R15: 000000000118bf2c Modules linked in: ---[ end trace 1ffb698c2967b85d ]--- RIP: 0010:tcf_dump_walker net/sched/act_api.c:240 [inline] RIP: 0010:tcf_generic_walker+0x367/0xba0 net/sched/act_api.c:343 Code: 24 31 ff 48 89 de e8 c8 55 eb fa 48 85 db 74 3f e8 3e 59 eb fa 48 8d 7d 30 48 b9 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <80> 3c 08 00 0f 85 26 07 00 00 48 8b 5d 30 31 ff 48 2b 1c 24 48 89 RSP: 0018:ffffc9001651f268 EFLAGS: 00010202 RAX: 0000000000000004 RBX: c00000010001eff3 RCX: dffffc0000000000 RDX: 0000000000040000 RSI: ffffffff868ae502 RDI: 0000000000000020 RBP: fffffffffffffff0 R08: 0000000000000000 R09: ffff88808df79c07 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880935f3700 R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000000 FS: 00007f4d14258700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056116e450a68 CR3: 0000000050ed0000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400