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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 ffff8880a7c3dbb8 by task syz-executor.3/22838

CPU: 1 PID: 22838 Comm: syz-executor.3 Not tainted 4.19.150-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: 0033:0x46087a
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:00007f5edcd0fa88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5edcd0fb20 RCX: 000000000046087a
RDX: 0000000020000040 RSI: 0000000020000100 RDI: 00007f5edcd0fae0
RBP: 00007f5edcd0fae0 R08: 00007f5edcd0fb20 R09: 0000000020000040
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000040
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020000080

Allocated by task 6515:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node+0x4c/0x70 mm/slab.c:3696
 kmalloc_node include/linux/slab.h:557 [inline]
 __vmalloc_area_node+0x15f/0x790 mm/vmalloc.c:1677
 __vmalloc_node_range mm/vmalloc.c:1753 [inline]
 __vmalloc_node mm/vmalloc.c:1804 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1818 [inline]
 vzalloc+0x10a/0x1a0 mm/vmalloc.c:1857
 alloc_counters net/ipv4/netfilter/ip_tables.c:803 [inline]
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:825 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1027 [inline]
 do_ipt_get_ctl+0x4ed/0x8e0 net/ipv4/netfilter/ip_tables.c:1703
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:122
 ip_getsockopt net/ipv4/ip_sockglue.c:1574 [inline]
 ip_getsockopt+0x167/0x1c0 net/ipv4/ip_sockglue.c:1554
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3616
 __sys_getsockopt+0x135/0x210 net/socket.c:1938
 __do_sys_getsockopt net/socket.c:1949 [inline]
 __se_sys_getsockopt net/socket.c:1946 [inline]
 __x64_sys_getsockopt+0xba/0x150 net/socket.c:1946
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6515:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x250 mm/slab.c:3822
 kvfree+0x59/0x60 mm/util.c:452
 __vunmap+0x330/0x470 mm/vmalloc.c:1534
 vfree+0x65/0x110 mm/vmalloc.c:1598
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:870 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1027 [inline]
 do_ipt_get_ctl+0x6e8/0x8e0 net/ipv4/netfilter/ip_tables.c:1703
 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:122
 ip_getsockopt net/ipv4/ip_sockglue.c:1574 [inline]
 ip_getsockopt+0x167/0x1c0 net/ipv4/ip_sockglue.c:1554
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3616
 __sys_getsockopt+0x135/0x210 net/socket.c:1938
 __do_sys_getsockopt net/socket.c:1949 [inline]
 __se_sys_getsockopt net/socket.c:1946 [inline]
 __x64_sys_getsockopt+0xba/0x150 net/socket.c:1946
 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 ffff8880a7c3db80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 32-byte region [ffff8880a7c3db80, ffff8880a7c3dba0)
The buggy address belongs to the page:
page:ffffea00029f0f40 count:1 mapcount:0 mapping:ffff88812c3f61c0 index:0xffff8880a7c3dfc1
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00027c60c8 ffffea00024c9ec8 ffff88812c3f61c0
raw: ffff8880a7c3dfc1 ffff8880a7c3d000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a7c3da80: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
 ffff8880a7c3db00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a7c3db80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
                                        ^
 ffff8880a7c3dc00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a7c3dc80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
squashfs: SQUASHFS error: unable to read inode lookup table