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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 ffff88808d7853c0 by task syz-executor190/8123

CPU: 1 PID: 8123 Comm: syz-executor190 Not tainted 4.19.194-syzkaller #0
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+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 __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+0x4b9/0x770 fs/char_dev.c:405
 do_dentry_open+0x4aa/0x1160 fs/open.c:796
 do_last fs/namei.c:3421 [inline]
 path_openat+0x793/0x2df0 fs/namei.c:3537
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446799
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f658e3632f8 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 8113:
 kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
 fuse_alloc_inode+0x1d/0x3f0 fs/fuse/inode.c:87
 alloc_inode+0x5d/0x180 fs/inode.c:211
 iget5_locked fs/inode.c:1131 [inline]
 iget5_locked+0x57/0xd0 fs/inode.c:1124
 fuse_iget+0x1a6/0x800 fs/fuse/inode.c:307
 fuse_lookup_name+0x413/0x5c0 fs/fuse/dir.c:341
 fuse_lookup+0xdf/0x410 fs/fuse/dir.c:368
 __lookup_slow+0x246/0x4a0 fs/namei.c:1672
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0x113/0x210 fs/stat.c:185
 vfs_fstatat include/linux/fs.h:3143 [inline]
 __do_sys_newfstatat fs/stat.c:364 [inline]
 __se_sys_newfstatat+0x9e/0x120 fs/stat.c:358
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 0:
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x7f/0x260 mm/slab.c:3765
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
 __do_softirq+0x265/0x980 kernel/softirq.c:292

The buggy address belongs to the object at ffff88808d785040
 which belongs to the cache fuse_inode of size 1264
The buggy address is located 896 bytes inside of
 1264-byte region [ffff88808d785040, ffff88808d785530)
The buggy address belongs to the page:
page:ffffea000235e140 count:1 mapcount:0 mapping:ffff8882395b8e00 index:0xffff88808d785ffe
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880b0e5a648 ffffea00022e01c8 ffff8882395b8e00
raw: ffff88808d785ffe ffff88808d785040 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808d785280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808d785300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88808d785380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88808d785400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808d785480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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