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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:51
Read of size 8 at addr ffff88808c3309e0 by task syz-executor.1/5058

CPU: 0 PID: 5058 Comm: syz-executor.1 Not tainted 4.19.152-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+0x22c/0x33e lib/dump_stack.c:118
 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256
 kasan_report_error.cold+0x66/0xb9 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_get_id+0x1bc/0x1f0 fs/squashfs/id.c:51
 squashfs_new_inode fs/squashfs/inode.c:64 [inline]
 squashfs_read_inode+0x197/0x1940 fs/squashfs/inode.c:133
 squashfs_fill_super+0x1277/0x190a fs/squashfs/super.c:318
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x318 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x51c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4608aa
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:00007fc7ecb38a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc7ecb38b20 RCX: 00000000004608aa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fc7ecb38ae0
RBP: 00007fc7ecb38ae0 R08: 00007fc7ecb38b20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000180

Allocated by task 6518:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc_track_caller+0x155/0x4e0 mm/slab.c:3742
 kstrdup+0x36/0x70 mm/util.c:56
 security_netlbl_sid_to_secattr+0x18f/0x300 security/selinux/ss/services.c:3682
 selinux_netlbl_sock_genattr+0xf4/0x430 security/selinux/netlabel.c:93
 selinux_netlbl_socket_post_create+0x73/0x160 security/selinux/netlabel.c:412
 selinux_socket_post_create+0x4d5/0x800 security/selinux/hooks.c:4643
 security_socket_post_create+0x64/0xc0 security/security.c:1381
 __sock_create+0x672/0x820 net/socket.c:1292
 sock_create net/socket.c:1316 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1346
 __do_sys_socket net/socket.c:1355 [inline]
 __se_sys_socket net/socket.c:1353 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1353
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6518:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x250 mm/slab.c:3822
 netlbl_secattr_destroy include/net/netlabel.h:378 [inline]
 netlbl_secattr_free include/net/netlabel.h:409 [inline]
 selinux_netlbl_sk_security_free+0x22f/0x300 security/selinux/netlabel.c:171
 selinux_sk_free_security+0x42/0x60 security/selinux/hooks.c:5235
 security_sk_free+0x3e/0x70 security/security.c:1474
 sk_prot_free net/core/sock.c:1499 [inline]
 __sk_destruct+0x517/0x830 net/core/sock.c:1584
 sk_destruct net/core/sock.c:1599 [inline]
 __sk_free+0x165/0x3b0 net/core/sock.c:1610
 sk_free+0x3b/0x50 net/core/sock.c:1621
 sock_put include/net/sock.h:1711 [inline]
 tcp_close+0xb47/0x1030 net/ipv4/tcp.c:2504
 inet_release+0xd7/0x1e0 net/ipv4/af_inet.c:427
 __sock_release+0xcd/0x2a0 net/socket.c:579
 sock_close+0x15/0x20 net/socket.c:1140
 __fput+0x2ce/0x8a0 fs/file_table.c:278
 task_work_run+0x141/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x269/0x2c0 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+0x57c/0x670 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88808c3309c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 32-byte region [ffff88808c3309c0, ffff88808c3309e0)
The buggy address belongs to the page:
page:ffffea000230cc00 count:1 mapcount:0 mapping:ffff88812c3f61c0 index:0xffff88808c330fc1
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00029ddc88 ffffea000279cc88 ffff88812c3f61c0
raw: ffff88808c330fc1 ffff88808c330000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808c330880: fb fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc
 ffff88808c330900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff88808c330980: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                                                       ^
 ffff88808c330a00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88808c330a80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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