netlink: 4 bytes leftover after parsing attributes in process `syz.0.11197'.
Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe000: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000ffff0000-0x00000000ffff0007]
CPU: 1 UID: 0 PID: 15758 Comm: syz.0.11197 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mld_clear_delrec+0x3a5/0x660
Code: ff ff ff e8 6d 31 41 01 89 c5 31 ff 89 c6 e8 e2 05 87 f7 85 ed 74 40 e8 99 01 87 f7 eb 05 e8 92 01 87 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 4c 6d ea f7 4d 8b 27 49 8d 7f 30
RSP: 0018:ffffc90022b66cf0 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: ffff88811c76f538 RCX: 0000000000080000
RDX: ffffc900094a9000 RSI: 000000000000bb23 RDI: 000000000000bb24
RBP: 0000000000000000 R08: ffffffff8fa38337 R09: 1ffffffff1f47066
R10: dffffc0000000000 R11: fffffbfff1f47067 R12: ffff888120792428
R13: dffffc0000000000 R14: ffff888120792400 R15: 00000000ffff0000
FS:  00007fbecafbc6c0(0000) GS:ffff8881a3c1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000506 CR3: 00000000476ce000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ipv6_mc_destroy_dev+0x45/0x5a0
 addrconf_ifdown+0x139e/0x1880
 addrconf_notify+0x1bc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 unregister_netdevice_many_notify+0x14d7/0x1ff0
 rtnl_dellink+0x488/0x710
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbeca18ebe9
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:00007fbecafbc038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbeca3b6090 RCX: 00007fbeca18ebe9
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007fbeca211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbeca3b6128 R14: 00007fbeca3b6090 R15: 00007ffd6f922f58
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mld_clear_delrec+0x3a5/0x660
Code: ff ff ff e8 6d 31 41 01 89 c5 31 ff 89 c6 e8 e2 05 87 f7 85 ed 74 40 e8 99 01 87 f7 eb 05 e8 92 01 87 f7 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 4c 6d ea f7 4d 8b 27 49 8d 7f 30
RSP: 0018:ffffc90022b66cf0 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: ffff88811c76f538 RCX: 0000000000080000
RDX: ffffc900094a9000 RSI: 000000000000bb23 RDI: 000000000000bb24
RBP: 0000000000000000 R08: ffffffff8fa38337 R09: 1ffffffff1f47066
R10: dffffc0000000000 R11: fffffbfff1f47067 R12: ffff888120792428
R13: dffffc0000000000 R14: ffff888120792400 R15: 00000000ffff0000
FS:  00007fbecafbc6c0(0000) GS:ffff8881a3c1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557d1a05c8 CR3: 00000000476ce000 CR4: 00000000000006f0
