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BUG: KASAN: slab-out-of-bounds in squashfs_inode_lookup fs/squashfs/export.c:57 [inline]
BUG: KASAN: slab-out-of-bounds in squashfs_export_iget+0x274/0x2a0 fs/squashfs/export.c:82
Read of size 8 at addr ffff88809f047ab8 by task syz-executor147/8106

CPU: 1 PID: 8106 Comm: syz-executor147 Not tainted 4.19.160-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/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 squashfs_inode_lookup fs/squashfs/export.c:57 [inline]
 squashfs_export_iget+0x274/0x2a0 fs/squashfs/export.c:82
 squashfs_fh_to_dentry fs/squashfs/export.c:97 [inline]
 squashfs_fh_to_dentry+0x78/0xb0 fs/squashfs/export.c:90
 exportfs_decode_fh+0x126/0x7d8 fs/exportfs/expfs.c:433
 do_handle_to_path fs/fhandle.c:152 [inline]
 handle_to_path fs/fhandle.c:207 [inline]
 do_handle_open+0x2f4/0x650 fs/fhandle.c:223
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4443e9
Code: 8d d7 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 5b d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd7b091d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000130
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004443e9
RDX: 0000000000490400 RSI: 0000000020000100 RDI: 0000000000000005
RBP: 00000000006cf018 R08: 00007ffd00000015 R09: 00000000004002e0
R10: 00007ffd7b091be0 R11: 0000000000000246 R12: 0000000000401fd0
R13: 0000000000402060 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc_track_caller+0x155/0x3c0 mm/slab.c:3742
 kstrdup+0x36/0x70 mm/util.c:56
 kstrdup_const+0x53/0x80 mm/util.c:77
 __kernfs_new_node+0x9b/0x680 fs/kernfs/dir.c:629
 kernfs_new_node+0x92/0x120 fs/kernfs/dir.c:693
 __kernfs_create_file+0x51/0x33f fs/kernfs/file.c:992
 cgroup_add_file kernel/cgroup/cgroup.c:3578 [inline]
 cgroup_addrm_files+0x399/0x980 kernel/cgroup/cgroup.c:3637
 css_populate_dir+0x19b/0x450 kernel/cgroup/cgroup.c:1628
 cgroup_apply_control_enable+0x3dd/0xc60 kernel/cgroup/cgroup.c:2955
 cgroup_mkdir+0x7d9/0x1090 kernel/cgroup/cgroup.c:5052
 kernfs_iop_mkdir+0x146/0x1d0 fs/kernfs/dir.c:1120
 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
 do_mkdirat+0x262/0x2d0 fs/namei.c:3842
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6243:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 single_release+0x8c/0xb0 fs/seq_file.c:597
 close_pdeo.part.0+0xda/0x2f0 fs/proc/inode.c:176
 close_pdeo fs/proc/inode.c:401 [inline]
 proc_reg_release+0x21e/0x270 fs/proc/inode.c:395
 __fput+0x2ce/0x890 fs/file_table.c:278
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809f047a80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 32-byte region [ffff88809f047a80, ffff88809f047aa0)
The buggy address belongs to the page:
page:ffffea00027c11c0 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff88809f047fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea000288bb08 ffffea000284b6c8 ffff88813bff01c0
raw: ffff88809f047fc1 ffff88809f047000 0000000100000026 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809f047980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809f047a00: 00 00 02 fc fc fc fc fc 00 01 fc fc fc fc fc fc
>ffff88809f047a80: 00 05 fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
                                        ^
 ffff88809f047b00: fb fb fb fb fc fc fc fc 00 07 fc fc fc fc fc fc
 ffff88809f047b80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
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