netlink: 20 bytes leftover after parsing attributes in process `syz-executor6'.
IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: slab-out-of-bounds in __list_add_valid+0x8f/0xb0 lib/list_debug.c:26
Read of size 8 at addr ffff8801ad4561d8 by task syz-executor3/3280

CPU: 1 PID: 3280 Comm: syz-executor3 Not tainted 4.17.0-rc7+ #78
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __list_add_valid+0x8f/0xb0 lib/list_debug.c:26
 __list_add include/linux/list.h:60 [inline]
 list_add_tail include/linux/list.h:93 [inline]
 cma_listen_on_all drivers/infiniband/core/cma.c:2301 [inline]
 rdma_listen+0x6cd/0x980 drivers/infiniband/core/cma.c:3327
 ucma_listen+0x19c/0x250 drivers/infiniband/core/ucma.c:1096
 ucma_write+0x328/0x410 drivers/infiniband/core/ucma.c:1676
 __vfs_write+0x10b/0x960 fs/read_write.c:485
 vfs_write+0x1f8/0x560 fs/read_write.c:549
 ksys_write+0xf9/0x250 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
IPVS: ftp: loaded support on port[0] = 21
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007faf212c9c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007faf212ca6d4 RCX: 0000000000455a09
RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007b5 R14: 0000000000700998 R15: 0000000000000000

Allocated by task 3292:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3644
 alloc_task_struct_node kernel/fork.c:157 [inline]
 dup_task_struct kernel/fork.c:771 [inline]
 copy_process.part.38+0x169d/0x6e70 kernel/fork.c:1632
 copy_process kernel/fork.c:1607 [inline]
 _do_fork+0x291/0x12a0 kernel/fork.c:2088
 __do_sys_clone kernel/fork.c:2195 [inline]
 __se_sys_clone kernel/fork.c:2189 [inline]
 __x64_sys_clone+0xbf/0x150 kernel/fork.c:2189
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4556:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
 free_task_struct kernel/fork.c:162 [inline]
 free_task+0x166/0x1d0 kernel/fork.c:390
 __put_task_struct+0x2d2/0x600 kernel/fork.c:658
 put_task_struct include/linux/sched/task.h:96 [inline]
 delayed_put_task_struct+0x367/0x470 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2675 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
 rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285

The buggy address belongs to the object at ffff8801ad4564c0
 which belongs to the cache task_struct(55:syz4) of size 5952
The buggy address is located 744 bytes to the left of
 5952-byte region [ffff8801ad4564c0, ffff8801ad457c00)
The buggy address belongs to the page:
page:ffffea0006b51580 count:1 mapcount:0 mapping:ffff8801ad4564c0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801ad4564c0 0000000000000000 0000000100000001
raw: ffffea0006c02c20 ffffea000626b4a0 ffff8801ac246b40 ffff8801b0cd45c0
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801b0cd45c0

Memory state around the buggy address:
 ffff8801ad456080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ad456100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801ad456180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                    ^
IPVS: ftp: loaded support on port[0] = 21
 ffff8801ad456200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801ad456280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================