squashfs: SQUASHFS error: Filesystem uses "unknown" compression. This is not supported
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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 ffff88809f9495b8 by task syz-executor.0/21012

CPU: 1 PID: 21012 Comm: syz-executor.0 Not tainted 4.19.147-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:68 [inline]
 squashfs_read_inode+0x1d3/0x1940 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: 0033:0x460bca
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 87 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 ba 87 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f1d518bfa88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1d518bfb20 RCX: 0000000000460bca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f1d518bfae0
RBP: 00007f1d518bfae0 R08: 00007f1d518bfb20 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010200

Allocated by task 6502:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc_track_caller+0x155/0x4e0 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 fs/kernfs/dir.c:693 [inline]
 kernfs_create_dir_ns+0x9e/0x230 fs/kernfs/dir.c:1019
 sysfs_create_dir_ns+0x127/0x290 fs/sysfs/dir.c:58
 create_dir lib/kobject.c:88 [inline]
 kobject_add_internal+0x296/0x9a0 lib/kobject.c:247
 kobject_add_varg lib/kobject.c:382 [inline]
 kobject_init_and_add+0x101/0x160 lib/kobject.c:453
 rx_queue_add_kobject net/core/net-sysfs.c:937 [inline]
 net_rx_queue_update_kobjects+0x1bb/0x450 net/core/net-sysfs.c:970
 register_queue_kobjects net/core/net-sysfs.c:1546 [inline]
 netdev_register_kobject+0x275/0x3af net/core/net-sysfs.c:1769
 register_netdevice+0xbbf/0x1270 net/core/dev.c:8717
 register_vlan_dev+0x31b/0x8d0 net/8021q/vlan.c:172
 vlan_newlink+0x477/0x6d0 net/8021q/vlan_netlink.c:189
 rtnl_newlink+0x1027/0x15b0 net/core/rtnetlink.c:3141
 rtnetlink_rcv_msg+0x498/0xc10 net/core/rtnetlink.c:4778
 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xc7/0x130 net/socket.c:632
 __sys_sendto+0x21a/0x320 net/socket.c:1787
 __do_sys_sendto net/socket.c:1799 [inline]
 __se_sys_sendto net/socket.c:1795 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1795
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4651:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x250 mm/slab.c:3822
 security_context_to_sid_core+0x2ed/0x610 security/selinux/ss/services.c:1504
 security_context_to_sid+0x35/0x40 security/selinux/ss/services.c:1525
 selinux_inode_setsecurity+0x197/0x3d0 security/selinux/hooks.c:3501
 selinux_inode_notifysecctx+0x2b/0x60 security/selinux/hooks.c:6667
 security_inode_notifysecctx+0x50/0xb0 security/security.c:1343
 kernfs_refresh_inode+0x328/0x4b0 fs/kernfs/inode.c:195
 kernfs_iop_permission+0x6a/0xb0 fs/kernfs/inode.c:302
 do_inode_permission fs/namei.c:386 [inline]
 inode_permission+0x34e/0x540 fs/namei.c:451
 may_lookup fs/namei.c:1703 [inline]
 link_path_walk.part.0+0x952/0x1230 fs/namei.c:2085
 link_path_walk fs/namei.c:2270 [inline]
 path_lookupat+0xe4/0x8d0 fs/namei.c:2318
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 do_readlinkat+0xcd/0x2f0 fs/stat.c:394
 __do_sys_readlinkat fs/stat.c:421 [inline]
 __se_sys_readlinkat fs/stat.c:418 [inline]
 __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:418
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809f949580
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 32-byte region [ffff88809f949580, ffff88809f9495a0)
The buggy address belongs to the page:
page:ffffea00027e5240 count:1 mapcount:0 mapping:ffff88812c3f61c0 index:0xffff88809f949fc1
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00026b7508 ffffea000277d0c8 ffff88812c3f61c0
raw: ffff88809f949fc1 ffff88809f949000 0000000100000039 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809f949480: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
 ffff88809f949500: fb fb fb fb fc fc fc fc 06 fc fc fc fc fc fc fc
>ffff88809f949580: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                                        ^
 ffff88809f949600: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88809f949680: 05 fc fc fc fc fc fc fc 00 00 01 fc fc fc fc fc
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