netlink: 4 bytes leftover after parsing attributes in process `syz.5.2810'. Oops: general protection fault, probably for non-canonical address 0xdffffc000000005d: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000002e8-0x00000000000002ef] CPU: 0 UID: 0 PID: 16543 Comm: syz.5.2810 Not tainted 6.16.0-rc4-syzkaller-00286-gc435a4f487e8 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:hfsc_qlen_notify+0x28/0x180 net/sched/sch_hfsc.c:1238 Code: 90 90 f3 0f 1e fa 41 54 55 53 48 89 f3 e8 10 4c 30 f8 48 8d bb ec 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 08 RSP: 0018:ffffc9000f367320 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90026301000 RDX: 000000000000005d RSI: ffffffff898b4110 RDI: 00000000000002ec RBP: 00000000000a000a R08: 0000000000000005 R09: 0000000000000000 R10: 00000000000a000a R11: 0000000000000001 R12: ffffffff8ce87ee0 R13: 0000000000000000 R14: ffffffff8ce87ec0 R15: ffff888073277000 FS: 0000000000000000(0000) GS:ffff888097522000(0063) knlGS:00000000f50e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002d615ff8 CR3: 000000006f774000 CR4: 0000000000352ef0 Call Trace: qdisc_tree_reduce_backlog+0x221/0x500 net/sched/sch_api.c:811 sfq_change net/sched/sch_sfq.c:740 [inline] sfq_init+0x88a/0x2540 net/sched/sch_sfq.c:804 qdisc_create+0x454/0xfc0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x12bb/0x2130 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x3c9/0xe90 net/core/rtnetlink.c:6953 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53d/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fc6579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f50e655c EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000080000040 RDX: 0000000000004000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hfsc_qlen_notify+0x28/0x180 net/sched/sch_hfsc.c:1238 Code: 90 90 f3 0f 1e fa 41 54 55 53 48 89 f3 e8 10 4c 30 f8 48 8d bb ec 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 08 RSP: 0018:ffffc9000f367320 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90026301000 RDX: 000000000000005d RSI: ffffffff898b4110 RDI: 00000000000002ec RBP: 00000000000a000a R08: 0000000000000005 R09: 0000000000000000 R10: 00000000000a000a R11: 0000000000000001 R12: ffffffff8ce87ee0 R13: 0000000000000000 R14: ffffffff8ce87ec0 R15: ffff888073277000 FS: 0000000000000000(0000) GS:ffff888097522000(0063) knlGS:00000000f50e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002d615ff8 CR3: 000000006f774000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: f3 0f 1e fa endbr64 6: 41 54 push %r12 8: 55 push %rbp 9: 53 push %rbx a: 48 89 f3 mov %rsi,%rbx d: e8 10 4c 30 f8 call 0xf8304c22 12: 48 8d bb ec 02 00 00 lea 0x2ec(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 08 test %ecx,(%rax)