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BUG: KASAN: use-after-free in __list_add_valid+0x81/0xa0 lib/list_debug.c:23
Read of size 8 at addr ffff8880b2e91448 by task syz-executor338/7993

CPU: 0 PID: 7993 Comm: syz-executor338 Not tainted 4.14.237-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __list_add_valid+0x81/0xa0 lib/list_debug.c:23
 __list_add include/linux/list.h:60 [inline]
 list_add include/linux/list.h:79 [inline]
 chrdev_open+0x45c/0x6d0 fs/char_dev.c:405
 do_dentry_open+0x44b/0xec0 fs/open.c:777
 vfs_open+0x105/0x220 fs/open.c:888
 do_last fs/namei.c:3428 [inline]
 path_openat+0x628/0x2970 fs/namei.c:3569
 do_filp_open+0x179/0x3c0 fs/namei.c:3603
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x446799
RSP: 002b:00007f465e6312f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004d0510 RCX: 0000000000446799
RDX: 0000000000000000 RSI: 0000000020002040 RDI: 00000000ffffff9c
RBP: 00000000004a0144 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 2f30656c69662f2e
R13: 000000000049e140 R14: 8000000000000000 R15: 00000000004d0518

Allocated by task 7983:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552
 fuse_alloc_inode+0x1d/0x3f0 fs/fuse/inode.c:87
 alloc_inode+0x5d/0x170 fs/inode.c:210
 iget5_locked+0x169/0x450 fs/inode.c:1050
 fuse_iget+0x164/0x730 fs/fuse/inode.c:307
 fuse_lookup_name+0x3bb/0x550 fs/fuse/dir.c:341
 fuse_lookup+0xcd/0x390 fs/fuse/dir.c:368
 lookup_slow+0x20a/0x400 fs/namei.c:1696
 walk_component+0x6a1/0xbc0 fs/namei.c:1825
 lookup_last fs/namei.c:2293 [inline]
 path_lookupat+0x1bb/0x780 fs/namei.c:2343
 filename_lookup+0x18a/0x510 fs/namei.c:2377
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xd1/0x180 fs/stat.c:185
 vfs_fstatat include/linux/fs.h:3076 [inline]
 SYSC_newfstatat fs/stat.c:364 [inline]
 SyS_newfstatat+0x8b/0xf0 fs/stat.c:358
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 0:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2699 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
 rcu_process_callbacks+0x780/0x1180 kernel/rcu/tree.c:2946
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288

The buggy address belongs to the object at ffff8880b2e910c0
 which belongs to the cache fuse_inode of size 1272
The buggy address is located 904 bytes inside of
 1272-byte region [ffff8880b2e910c0, ffff8880b2e915b8)
The buggy address belongs to the page:
page:ffffea0002cba400 count:1 mapcount:0 mapping:ffff8880b2e90040 index:0xffff8880b2e91ffb compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880b2e90040 ffff8880b2e91ffb 0000000100000005
raw: ffff8880b1327448 ffff8880b1327448 ffff8880b1326540 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b2e91300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880b2e91380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880b2e91400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff8880b2e91480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880b2e91500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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