loop4: detected capacity change from 8 to 0
==================================================================
BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:38
Read of size 8 at addr ffff888011f9b128 by task syz-executor.4/19222

CPU: 1 PID: 19222 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:51 [inline]
 squashfs_read_inode+0x1b4/0x1b40 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1140/0x23b0 fs/squashfs/super.c:310
 get_tree_bdev+0x440/0x760 fs/super.c:1291
 vfs_get_tree+0x89/0x2f0 fs/super.c:1496
 do_new_mount fs/namespace.c:2878 [inline]
 path_mount+0x13ad/0x20c0 fs/namespace.c:3208
 do_mount fs/namespace.c:3221 [inline]
 __do_sys_mount fs/namespace.c:3429 [inline]
 __se_sys_mount fs/namespace.c:3406 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3406
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460c6a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fbfa2822a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbfa2822b10 RCX: 0000000000460c6a
RDX: 0000000020001a00 RSI: 0000000020000300 RDI: 00007fbfa2822ad0
RBP: 00007fbfa2822ad0 R08: 00007fbfa2822b10 R09: 0000000020001a00
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020001a00
R13: 0000000020000300 R14: 0000000020000400 R15: 0000000020001280

Allocated by task 1:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kasan_slab_alloc include/linux/kasan.h:205 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2891 [inline]
 slab_alloc mm/slub.c:2899 [inline]
 __kmalloc_track_caller+0x1d7/0x3b0 mm/slub.c:4464
 kstrdup+0x36/0x70 mm/util.c:60
 kstrdup_const+0x53/0x80 mm/util.c:83
 __kernfs_new_node+0x9d/0x8b0 fs/kernfs/dir.c:622
 kernfs_new_node fs/kernfs/dir.c:688 [inline]
 kernfs_create_dir_ns+0x9c/0x220 fs/kernfs/dir.c:1025
 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:89 [inline]
 kobject_add_internal+0x2d2/0xa60 lib/kobject.c:255
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_add+0x150/0x1c0 lib/kobject.c:442
 device_add+0x36a/0x1d90 drivers/base/core.c:3024
 tty_register_device_attr+0x395/0x7b0 drivers/tty/tty_io.c:3150
 tty_register_device drivers/tty/tty_io.c:3084 [inline]
 tty_register_driver+0x428/0x800 drivers/tty/tty_io.c:3355
 legacy_pty_init drivers/tty/pty.c:602 [inline]
 pty_init+0x69e/0xe58 drivers/tty/pty.c:966
 do_one_initcall+0x103/0x650 init/main.c:1217
 do_initcall_level init/main.c:1290 [inline]
 do_initcalls init/main.c:1306 [inline]
 do_basic_setup init/main.c:1326 [inline]
 kernel_init_freeable+0x605/0x689 init/main.c:1527
 kernel_init+0xd/0x1b8 init/main.c:1415
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

The buggy address belongs to the object at ffff888011f9b118
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 8 bytes to the right of
 8-byte region [ffff888011f9b118, ffff888011f9b120)
The buggy address belongs to the page:
page:000000001e3c322e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f9b
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea000047a480 0000001500000015 ffff888010041c80
raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888011f9b000: fa fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00
 ffff888011f9b080: fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc
>ffff888011f9b100: fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc
                                  ^
 ffff888011f9b180: fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc
 ffff888011f9b200: fc 00 fc fc fc fc 00 fc fc fc fc fb fc fc fc fc
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