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BUG: KASAN: slab-out-of-bounds in __list_add_valid+0x8f/0xb0 lib/list_debug.c:26
Read of size 8 at addr ffff88817b9f0720 by task syz-executor2/30294

CPU: 1 PID: 30294 Comm: syz-executor2 Not tainted 4.20.0 #166
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+0x1d3/0x2c6 lib/dump_stack.c:113
 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.9+0x242/0x309 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:2474 [inline]
 rdma_listen+0x6dc/0x990 drivers/infiniband/core/cma.c:3489
 ucma_listen+0x1a4/0x260 drivers/infiniband/core/ucma.c:1100
 ucma_write+0x365/0x460 drivers/infiniband/core/ucma.c:1689
 __vfs_write+0x119/0x9f0 fs/read_write.c:485
 vfs_write+0x1fc/0x560 fs/read_write.c:549
 ksys_write+0x101/0x260 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+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457669
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007efd886b6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669
RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efd886b76d4
R13: 00000000004c5f47 R14: 00000000004daa40 R15: 00000000ffffffff

Allocated by task 6138:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554
 getname_flags+0xd0/0x590 fs/namei.c:140
 user_path_at_empty+0x2d/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 do_utimes+0x1d0/0x380 fs/utimes.c:123
 __do_sys_utimensat fs/utimes.c:155 [inline]
 __se_sys_utimensat fs/utimes.c:139 [inline]
 __x64_sys_utimensat+0x1b8/0x2a0 fs/utimes.c:139
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6138:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 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+0x83/0x290 mm/slab.c:3760
 putname+0xf2/0x130 fs/namei.c:261
 filename_lookup+0x39a/0x520 fs/namei.c:2357
 user_path_at_empty+0x40/0x50 fs/namei.c:2608
 user_path_at include/linux/namei.h:57 [inline]
 do_utimes+0x1d0/0x380 fs/utimes.c:123
 __do_sys_utimensat fs/utimes.c:155 [inline]
 __se_sys_utimensat fs/utimes.c:139 [inline]
 __x64_sys_utimensat+0x1b8/0x2a0 fs/utimes.c:139
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88817b9f0840
 which belongs to the cache names_cache of size 4096
The buggy address is located 288 bytes to the left of
 4096-byte region [ffff88817b9f0840, ffff88817b9f1840)
The buggy address belongs to the page:
page:ffffea0005ee7c00 count:1 mapcount:0 mapping:ffff8881da986e40 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000010200(slab|head)
raw: 02fffc0000010200 ffffea0007041b08 ffffea0006f71788 ffff8881da986e40
raw: 0000000000000000 ffff88817b9f0840 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88817b9f0600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88817b9f0680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88817b9f0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88817b9f0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88817b9f0800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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