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BUG: KASAN: slab-out-of-bounds in kvm_clear_dirty_log_protect+0x8cf/0x970 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1262
Read of size 8 at addr ffff888084ebb990 by task syz-executor4/13331

CPU: 1 PID: 13331 Comm: syz-executor4 Not tainted 4.20.0+ #3
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+0x1db/0x2d0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
kernel msg: ebtables bug: please report to author: Valid hook without chain
 kvm_clear_dirty_log_protect+0x8cf/0x970 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1262
 kvm_vm_ioctl_clear_dirty_log+0xff/0x260 arch/x86/kvm/x86.c:4468
 kvm_vm_ioctl+0xc19/0x1fe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3127
kernel msg: ebtables bug: please report to author: Valid hook without chain
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f17c7956c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000020000080 RSI: 00000000c018aec0 RDI: 0000000000000004
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f17c79576d4
R13: 00000000004c9ef0 R14: 00000000004d2a10 R15: 00000000ffffffff

Allocated by task 13331:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 kasan_kmalloc mm/kasan/common.c:482 [inline]
 kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455
 __do_kmalloc_node mm/slab.c:3671 [inline]
 __kmalloc_node+0x4e/0x70 mm/slab.c:3678
 kmalloc_node include/linux/slab.h:588 [inline]
 kvmalloc_node+0x68/0x100 mm/util.c:416
 kvmalloc include/linux/mm.h:602 [inline]
 kvzalloc include/linux/mm.h:610 [inline]
 kvm_create_dirty_bitmap arch/x86/kvm/../../../virt/kvm/kvm_main.c:792 [inline]
 __kvm_set_memory_region+0x1da1/0x2c40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1018
 kvm_set_memory_region+0x2f/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1084
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1096 [inline]
 kvm_vm_ioctl+0xafa/0x1fe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3108
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

kobject: 'batman_adv' (000000006e295b2f): kobject_add_internal: parent: 'vet', set: '<NULL>'
Freed by task 3003:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452
 __cache_free mm/slab.c:3485 [inline]
 kfree+0xcf/0x230 mm/slab.c:3804
 batadv_mcast_mla_list_free net/batman-adv/multicast.c:315 [inline]
 __batadv_mcast_mla_update net/batman-adv/multicast.c:639 [inline]
 batadv_mcast_mla_update+0xc28/0x2980 net/batman-adv/multicast.c:661
kernel msg: ebtables bug: please report to author: Valid hook without chain
 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff888084ebb980
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff888084ebb980, ffff888084ebb9a0)
The buggy address belongs to the page:
page:ffffea000213aec0 count:1 mapcount:0 mapping:ffff88812c3f01c0 index:0xffff888084ebbfc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00024732c8 ffffea000220bf88 ffff88812c3f01c0
raw: ffff888084ebbfc1 ffff888084ebb000 000000010000003e 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888084ebb880: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
 ffff888084ebb900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff888084ebb980: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                         ^
 ffff888084ebba00: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
 ffff888084ebba80: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
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