netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 124df6067 P4D 124df6067 PUD 1266fd067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 12764 Comm: syz-executor.1 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0x5f/0x93 lib/list_debug.c:51 Code: 00 00 00 00 ad de 49 39 c5 0f 84 91 00 00 00 48 b8 22 01 00 00 00 00 ad de 49 39 c6 0f 84 b7 00 00 00 4c 89 f7 e8 e1 f3 05 ff <4d> 8b 36 4d 39 e6 0f 85 8f 00 00 00 49 8d 7d 08 e8 cc f3 05 ff 49 RSP: 0018:ffffc9000229f838 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880a3ca3400 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc9000229f850 R08: ffff888122af8000 R09: ffff8880a3ca3400 R10: 0000000000003944 R11: 0000000000e53492 R12: ffff8880a3ca35e0 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85cb8720 FS: 00007fd78fb0a700(0000) GS:ffff88812bf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000121f83000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:131 [inline] list_del include/linux/list.h:139 [inline] cbs_destroy+0x77/0x190 net/sched/sch_cbs.c:435 qdisc_create+0x76f/0x990 net/sched/sch_api.c:1285 tc_modify_qdisc+0x288/0x10c0 net/sched/sch_api.c:1652 rtnetlink_rcv_msg+0x1d3/0x500 net/core/rtnetlink.c:5223 netlink_rcv_skb+0xb0/0x260 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:5241 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x354/0x430 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x456/0x770 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0x9f/0xc0 net/socket.c:657 ___sys_sendmsg+0x59d/0x5d0 net/socket.c:2311 __sys_sendmsg+0xa0/0x160 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x51/0x70 net/socket.c:2363 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x459a29 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:00007fd78fb09c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a29 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd78fb0a6d4 R13: 00000000004c7b79 R14: 00000000004dd900 R15: 00000000ffffffff Modules linked in: CR2: 0000000000000000 ---[ end trace 3dce5d2f7fc22b0d ]--- RIP: 0010:__list_del_entry_valid+0x5f/0x93 lib/list_debug.c:51 Code: 00 00 00 00 ad de 49 39 c5 0f 84 91 00 00 00 48 b8 22 01 00 00 00 00 ad de 49 39 c6 0f 84 b7 00 00 00 4c 89 f7 e8 e1 f3 05 ff <4d> 8b 36 4d 39 e6 0f 85 8f 00 00 00 49 8d 7d 08 e8 cc f3 05 ff 49 RSP: 0018:ffffc9000229f838 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880a3ca3400 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc9000229f850 R08: ffff888122af8000 R09: ffff8880a3ca3400 R10: 0000000000003944 R11: 0000000000e53492 R12: ffff8880a3ca35e0 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85cb8720 FS: 00007fd78fb0a700(0000) GS:ffff88812bf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000121f83000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400