loop5: detected capacity change from 8 to 0
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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:38
Read of size 8 at addr ffff8880139bee48 by task syz-executor.5/22092

CPU: 0 PID: 22092 Comm: syz-executor.5 Not tainted 5.11.0-rc5-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:2881 [inline]
 path_mount+0x13ad/0x20c0 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3409
 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:00007f321dea0a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f321dea0b10 RCX: 0000000000460c6a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f321dea0ad0
RBP: 00007f321dea0ad0 R08: 00007f321dea0b10 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010300

Allocated by task 20819:
 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:209 [inline]
 slab_post_alloc_hook mm/slab.h:512 [inline]
 slab_alloc_node mm/slub.c:2892 [inline]
 slab_alloc mm/slub.c:2900 [inline]
 __kmalloc_track_caller+0x1d7/0x3b0 mm/slub.c:4465
 kmemdup+0x23/0x50 mm/util.c:128
 kmemdup include/linux/string.h:520 [inline]
 shmem_symlink+0x185/0x7c0 mm/shmem.c:3163
 vfs_symlink fs/namei.c:3962 [inline]
 vfs_symlink+0x44e/0x690 fs/namei.c:3948
 do_symlinkat+0x258/0x2c0 fs/namei.c:3989
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 20819:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:192 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
 slab_free mm/slub.c:3143 [inline]
 kfree+0xdb/0x3b0 mm/slub.c:4125
 shmem_free_in_core_inode+0x8b/0xa0 mm/shmem.c:3835
 i_callback+0x3f/0x70 fs/inode.c:222
 rcu_do_batch kernel/rcu/tree.c:2489 [inline]
 rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343

The buggy address belongs to the object at ffff8880139bee38
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 8 bytes to the right of
 8-byte region [ffff8880139bee38, ffff8880139bee40)
The buggy address belongs to the page:
page:00000000cd689077 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x139be
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea000047d100 0000001800000018 ffff888010041c80
raw: 0000000000000000 0000000000660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880139bed00: fc fc fc fc fa fc fc fc fc 00 fc fc fc fc 00 fc
 ffff8880139bed80: fc fc fc 00 fc fc fc fc fa fc fc fc fc 00 fc fc
>ffff8880139bee00: fc fc 00 fc fc fc fc fa fc fc fc fc 00 fc fc fc
                                              ^
 ffff8880139bee80: fc 00 fc fc fc fc 00 fc fc fc fc fa fc fc fc fc
 ffff8880139bef00: fa fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa
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