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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
Read of size 8 at addr ffff88801cc23830 by task syz-executor046/8494

CPU: 0 PID: 8494 Comm: syz-executor046 Not tainted 5.10.0-rc2-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+0x107/0x163 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385
 __kasan_report mm/kasan/report.c:545 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562
 squashfs_get_id+0x1ae/0x1d0 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+0x421/0x740 fs/super.c:1344
 vfs_get_tree+0x89/0x2f0 fs/super.c:1549
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x13ad/0x20c0 fs/namespace.c:3205
 do_mount fs/namespace.c:3218 [inline]
 __do_sys_mount fs/namespace.c:3426 [inline]
 __se_sys_mount fs/namespace.c:3403 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3403
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d4a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad 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 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffe33247b88 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe33247be0 RCX: 0000000000446d4a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe33247ba0
RBP: 00007ffe33247ba0 R08: 00007ffe33247be0 R09: 00007ffe00000015
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003

Allocated by task 8410:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 lsm_cred_alloc security/security.c:533 [inline]
 security_prepare_creds+0x10e/0x190 security/security.c:1632
 prepare_creds+0x4bd/0x6c0 kernel/cred.c:285
 access_override_creds fs/open.c:353 [inline]
 do_faccessat+0x3d7/0x820 fs/open.c:417
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 8410:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422
 slab_free_hook mm/slub.c:1544 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577
 slab_free mm/slub.c:3142 [inline]
 kfree+0xdb/0x360 mm/slub.c:4124
 security_cred_free+0xc3/0x130 security/security.c:1626
 put_cred_rcu+0x122/0x4a0 kernel/cred.c:114
 __put_cred+0x1de/0x250 kernel/cred.c:148
 put_cred include/linux/cred.h:287 [inline]
 put_cred include/linux/cred.h:280 [inline]
 revert_creds+0x1a8/0x1f0 kernel/cred.c:598
 do_faccessat+0x2ca/0x820 fs/open.c:464
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88801cc23820
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 8 bytes to the right of
 8-byte region [ffff88801cc23820, ffff88801cc23828)
The buggy address belongs to the page:
page:00000000204051e6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cc23
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea0000823e40 0000000200000002 ffff888010041c80
raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88801cc23700: fc fa fc fc fc fc fa fc fc fc fc 00 fc fc fc fc
 ffff88801cc23780: fa fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa
>ffff88801cc23800: fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa fc
                                     ^
 ffff88801cc23880: fc fc fc fa fc fc fc fc fa fc fc fc fc fa fc fc
 ffff88801cc23900: fc fc fa fc fc fc fc fa fc fc fc fc fa fc fc fc
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