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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 ffff888028576f38 by task syz-executor.3/21909

CPU: 3 PID: 21909 Comm: syz-executor.3 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:55 [inline]
 squashfs_read_inode+0x1d3/0x1940 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1079/0x1ecf fs/squashfs/super.c:310
 get_tree_bdev+0x421/0x740 fs/super.c:1342
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x1387/0x20a0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount fs/namespace.c:3390 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ee5a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d 9e 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 4a 9e fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f24d4665aa8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f24d4665b40 RCX: 000000000045ee5a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f24d4665b00
RBP: 00007f24d4665b00 R08: 00007f24d4665b40 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010200

Allocated by task 10555:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 kmem_cache_alloc_trace+0x174/0x300 mm/slab.c:3550
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 selinux_sk_alloc_security+0x83/0x1c0 security/selinux/hooks.c:5123
 security_sk_alloc+0x50/0xb0 security/security.c:2180
 sk_prot_alloc+0xae/0x300 net/core/sock.c:1688
 sk_alloc+0x32/0xbd0 net/core/sock.c:1739
 inet_create net/ipv4/af_inet.c:322 [inline]
 inet_create+0x3ae/0xe90 net/ipv4/af_inet.c:248
 __sock_create+0x3de/0x780 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socket+0xef/0x200 net/socket.c:1520
 __do_sys_socket net/socket.c:1529 [inline]
 __se_sys_socket net/socket.c:1527 [inline]
 __x64_sys_socket+0x6f/0xb0 net/socket.c:1527
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 10555:
 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+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kfree+0x10e/0x2b0 mm/slab.c:3756
 security_sk_free+0x3e/0x70 security/security.c:2185
 sk_prot_free net/core/sock.c:1718 [inline]
 __sk_destruct+0x537/0x860 net/core/sock.c:1807
 sk_destruct+0xbd/0xe0 net/core/sock.c:1822
 __sk_free+0xef/0x3d0 net/core/sock.c:1833
 sk_free+0x78/0xa0 net/core/sock.c:1844
 sock_put include/net/sock.h:1781 [inline]
 tcp_close+0xb4c/0x1210 net/ipv4/tcp.c:2578
 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431
 __sock_release+0xcd/0x280 net/socket.c:596
 sock_close+0x18/0x20 net/socket.c:1277
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:165 [inline]
 exit_to_user_mode_prepare+0x1e1/0x200 kernel/entry/common.c:192
 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:267
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888028576f00
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 32-byte region [ffff888028576f00, ffff888028576f20)
The buggy address belongs to the page:
page:0000000077032c4c refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888028576fc1 pfn:0x28576
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0000876188 ffffea0000a2ac08 ffff88802c840100
raw: ffff888028576fc1 ffff888028576000 000000010000003c ffff88800fd8c801
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88800fd8c801

Memory state around the buggy address:
 ffff888028576e00: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
 ffff888028576e80: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff888028576f00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
                                        ^
 ffff888028576f80: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888028577000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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