netlink: 4 bytes leftover after parsing attributes in process `syz.2.12644'.
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: 0 UID: 0 PID: 2147 Comm: syz.2.12644 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:ip6_mc_clear_src+0x18f/0x580
Code: ff ff ff e8 93 e5 41 01 89 c5 31 ff 89 c6 e8 08 fa 87 f7 85 ed 74 45 e8 bf f5 87 f7 eb 05 e8 b8 f5 87 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 f2 5e eb f7 49 8b 2c 24 49 8d 7c
RSP: 0018:ffffc900093c6ca0 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: 1ffff110051d8882 RCX: 0000000000080000
RDX: ffffc90008299000 RSI: 0000000000001d37 RDI: 0000000000001d38
RBP: 0000000000000000 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: 00000000ffff0000
R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888028ec4410
FS:  00007f3fef7f66c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3250bff8 CR3: 000000010fd2c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 mld_clear_delrec+0x160/0x660
 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: 0033:0x7f3ff158ebe9
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:00007f3fef7f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3ff17c5fa0 RCX: 00007f3ff158ebe9
RDX: 0000000000000800 RSI: 0000200000000040 RDI: 0000000000000005
RBP: 00007f3ff1611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ff17c6038 R14: 00007f3ff17c5fa0 R15: 00007fff83545338
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ip6_mc_clear_src+0x18f/0x580
Code: ff ff ff e8 93 e5 41 01 89 c5 31 ff 89 c6 e8 08 fa 87 f7 85 ed 74 45 e8 bf f5 87 f7 eb 05 e8 b8 f5 87 f7 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 f2 5e eb f7 49 8b 2c 24 49 8d 7c
RSP: 0018:ffffc900093c6ca0 EFLAGS: 00010206
RAX: 000000001fffe000 RBX: 1ffff110051d8882 RCX: 0000000000080000
RDX: ffffc90008299000 RSI: 0000000000001d37 RDI: 0000000000001d38
RBP: 0000000000000000 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: 00000000ffff0000
R13: dffffc0000000000 R14: 0000000000000538 R15: ffff888028ec4410
FS:  00007f3fef7f66c0(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32715ff8 CR3: 000000010fd2c000 CR4: 00000000000006f0
