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BUG: KASAN: use-after-free in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
Read of size 8 at addr ffff888029764110 by task syz-executor.3/32041

CPU: 0 PID: 32041 Comm: syz-executor.3 Not tainted 5.9.0-rc7-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+0xf3/0x110 fs/namespace.c:3205
 __do_compat_sys_mount fs/compat.c:122 [inline]
 __se_compat_sys_mount fs/compat.c:89 [inline]
 __ia32_compat_sys_mount+0x193/0x710 fs/compat.c:89
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f5b549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5554f00 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f5554f70 RCX: 0000000020000100
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 00000000f5554fb0
RBP: 00000000f5554fb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8822:
 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
 kmalloc_node include/linux/slab.h:577 [inline]
 __vmalloc_area_node+0x589/0x7a0 mm/vmalloc.c:2429
 __vmalloc_node_range mm/vmalloc.c:2511 [inline]
 __vmalloc_node mm/vmalloc.c:2554 [inline]
 vmalloc+0x116/0x1a0 mm/vmalloc.c:2587
 xt_compat_init_offsets+0xdf/0x220 net/netfilter/x_tables.c:711
 compat_table_info+0xb7/0x5b0 net/ipv4/netfilter/ip_tables.c:935
 compat_get_entries+0x1d2/0x770 net/ipv4/netfilter/ip_tables.c:1594
 do_ipt_get_ctl+0x4ed/0x9d0 net/ipv4/netfilter/ip_tables.c:1657
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt net/ipv4/ip_sockglue.c:1778 [inline]
 ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1757
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3876
 __sys_getsockopt+0x219/0x4c0 net/socket.c:2173
 __do_compat_sys_socketcall+0x513/0x660 net/compat.c:495
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

The buggy address belongs to the object at ffff888029764100
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff888029764100, ffff888029764120)
The buggy address belongs to the page:
page:000000002c996974 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888029764fc1 pfn:0x29764
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00007d4f48 ffffea0000a71e88 ffff88802c840100
raw: ffff888029764fc1 ffff888029764000 0000000100000039 ffff88801d3da401
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88801d3da401

Memory state around the buggy address:
 ffff888029764000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888029764080: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
>ffff888029764100: fb fb fb fb fc fc fc fc 00 01 fc fc fc fc fc fc
                         ^
 ffff888029764180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888029764200: fa fb fb fb fc fc fc fc 00 01 fc fc fc fc fc fc
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