loop4: detected capacity change from 8 to 0
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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:38
Read of size 8 at addr ffff888020312560 by task syz-executor.4/27957

CPU: 1 PID: 27957 Comm: syz-executor.4 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 squashfs_get_id+0x1bc/0x1f0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:51 [inline]
 squashfs_read_inode+0x1b4/0x1b40 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1140/0x23b0 fs/squashfs/super.c:310
 get_tree_bdev+0x440/0x760 fs/super.c:1291
 vfs_get_tree+0x89/0x2f0 fs/super.c:1496
 do_new_mount fs/namespace.c:2881 [inline]
 path_mount+0x13ad/0x20c0 fs/namespace.c:3211
 do_mount fs/namespace.c:3224 [inline]
 __do_sys_mount fs/namespace.c:3432 [inline]
 __se_sys_mount fs/namespace.c:3409 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3409
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x460c6a
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:00007fe586a85a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe586a85b10 RCX: 0000000000460c6a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe586a85ad0
RBP: 00007fe586a85ad0 R08: 00007fe586a85b10 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010300

Allocated by task 8501:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
 kmalloc_node include/linux/slab.h:575 [inline]
 __vmalloc_area_node+0x556/0x6e0 mm/vmalloc.c:2495
 __vmalloc_node_range mm/vmalloc.c:2576 [inline]
 __vmalloc_node mm/vmalloc.c:2619 [inline]
 vzalloc+0x116/0x1a0 mm/vmalloc.c:2672
 alloc_counters net/ipv4/netfilter/arp_tables.c:659 [inline]
 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:680 [inline]
 get_entries net/ipv4/netfilter/arp_tables.c:866 [inline]
 do_arpt_get_ctl+0x5ef/0x8f0 net/ipv4/netfilter/arp_tables.c:1450
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline]
 ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4142
 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156
 __do_sys_getsockopt net/socket.c:2171 [inline]
 __se_sys_getsockopt net/socket.c:2168 [inline]
 __x64_sys_getsockopt+0xba/0x150 net/socket.c:2168
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 8501:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356
 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362
 kasan_slab_free include/linux/kasan.h:192 [inline]
 slab_free_hook mm/slub.c:1547 [inline]
 slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580
 slab_free mm/slub.c:3142 [inline]
 kfree+0xdb/0x3b0 mm/slub.c:4124
 kvfree+0x42/0x50 mm/util.c:616
 __vunmap+0x903/0xb50 mm/vmalloc.c:2290
 __vfree+0x3c/0xd0 mm/vmalloc.c:2333
 vfree+0x5a/0x90 mm/vmalloc.c:2364
 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:712 [inline]
 get_entries net/ipv4/netfilter/arp_tables.c:866 [inline]
 do_arpt_get_ctl+0x7b2/0x8f0 net/ipv4/netfilter/arp_tables.c:1450
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline]
 ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4142
 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156
 __do_sys_getsockopt net/socket.c:2171 [inline]
 __se_sys_getsockopt net/socket.c:2168 [inline]
 __x64_sys_getsockopt+0xba/0x150 net/socket.c:2168
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888020312550
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 8 bytes to the right of
 8-byte region [ffff888020312550, ffff888020312558)
The buggy address belongs to the page:
page:000000003a1ef819 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20312
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea00005e1040 0000000900000009 ffff888010041c80
raw: 0000000000000000 0000000000660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888020312400: fc fc 00 fc fc fc fc fa fc fc fc fc 00 fc fc fc
 ffff888020312480: fc fa fc fc fc fc fa fc fc fc fc 00 fc fc fc fc
>ffff888020312500: 00 fc fc fc fc fa fc fc fc fc fa fc fc fc fc 00
                                                       ^
 ffff888020312580: fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc fa fc
 ffff888020312600: fc fc fc fa fc fc fc fc 00 fc fc fc fc fa fc fc
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