netlink: 'syz.2.3614': attribute type 33 has an invalid length. Oops: general protection fault, probably for non-canonical address 0xdffffc001fffc1ac: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x00000000fffe0d60-0x00000000fffe0d67] CPU: 1 UID: 0 PID: 19080 Comm: syz.2.3614 Not tainted 6.16.0-rc1-syzkaller-00102-g5466491c9e33 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline] RIP: 0010:__ip_mc_dec_group+0x2fd/0x690 net/ipv4/igmp.c:1774 Code: f9 ad d0 f7 c6 05 b3 34 9b 05 01 48 c7 c7 40 95 9c 8c be 97 05 00 00 48 c7 c2 c0 95 9c 8c e8 9a ae ae f7 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 34 25 34 f8 4d 8b 2c 24 4d 39 f5 RSP: 0018:ffffc90003dced38 EFLAGS: 00010206 RAX: ffffffff89efb0be RBX: 000000001fffc1ac RCX: 0000000000080000 RDX: ffffc9000da00000 RSI: 0000000000000ede RDI: 0000000000000edf RBP: ffff88805addb820 R08: ffffffff8f50f927 R09: 1ffffffff1ea1f24 R10: dffffc0000000000 R11: fffffbfff1ea1f25 R12: 00000000fffe0d60 R13: dffffc0000000000 R14: ffff8880213bb600 R15: 1ffff1100b5bb704 FS: 00007f56c19b06c0(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c33b178 CR3: 00000000788ca000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: inetdev_event+0x2a7/0x15b0 net/ipv4/devinet.c:1642 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] dev_close_many+0x29c/0x410 net/core/dev.c:1785 unregister_netdevice_many_notify+0x619/0x2320 net/core/dev.c:12039 rtnl_delete_link net/core/rtnetlink.c:3511 [inline] rtnl_dellink+0x488/0x710 net/core/rtnetlink.c:3553 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f56c0b8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f56c19b0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f56c0db6080 RCX: 00007f56c0b8e929 RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000006 RBP: 00007f56c0c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f56c0db6080 R15: 00007ffdf02ad878 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline] RIP: 0010:__ip_mc_dec_group+0x2fd/0x690 net/ipv4/igmp.c:1774 Code: f9 ad d0 f7 c6 05 b3 34 9b 05 01 48 c7 c7 40 95 9c 8c be 97 05 00 00 48 c7 c2 c0 95 9c 8c e8 9a ae ae f7 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 34 25 34 f8 4d 8b 2c 24 4d 39 f5 RSP: 0018:ffffc90003dced38 EFLAGS: 00010206 RAX: ffffffff89efb0be RBX: 000000001fffc1ac RCX: 0000000000080000 RDX: ffffc9000da00000 RSI: 0000000000000ede RDI: 0000000000000edf RBP: ffff88805addb820 R08: ffffffff8f50f927 R09: 1ffffffff1ea1f24 R10: dffffc0000000000 R11: fffffbfff1ea1f25 R12: 00000000fffe0d60 R13: dffffc0000000000 R14: ffff8880213bb600 R15: 1ffff1100b5bb704 FS: 00007f56c19b06c0(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3aaa21 CR3: 00000000788ca000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f9 stc 1: ad lods %ds:(%rsi),%eax 2: d0 f7 shl %bh 4: c6 05 b3 34 9b 05 01 movb $0x1,0x59b34b3(%rip) # 0x59b34be b: 48 c7 c7 40 95 9c 8c mov $0xffffffff8c9c9540,%rdi 12: be 97 05 00 00 mov $0x597,%esi 17: 48 c7 c2 c0 95 9c 8c mov $0xffffffff8c9c95c0,%rdx 1e: e8 9a ae ae f7 call 0xf7aeaebd 23: 4c 89 e3 mov %r12,%rbx 26: 48 c1 eb 03 shr $0x3,%rbx * 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 34 25 34 f8 call 0xf834256d 39: 4d 8b 2c 24 mov (%r12),%r13 3d: 4d 39 f5 cmp %r14,%r13