================================================================== BUG: KASAN: slab-out-of-bounds in search_memslots include/linux/kvm_host.h:1051 [inline] BUG: KASAN: slab-out-of-bounds in __gfn_to_memslot include/linux/kvm_host.h:1063 [inline] BUG: KASAN: slab-out-of-bounds in kvm_vcpu_gfn_to_memslot+0x50e/0x540 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1603 Read of size 8 at addr ffff8880a1606468 by task syz-executor.5/8606 CPU: 0 PID: 8606 Comm: syz-executor.5 Not tainted 5.7.0-rc1-next-20200415-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 search_memslots include/linux/kvm_host.h:1051 [inline] __gfn_to_memslot include/linux/kvm_host.h:1063 [inline] kvm_vcpu_gfn_to_memslot+0x50e/0x540 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1603 try_async_pf+0x12b/0xac0 arch/x86/kvm/mmu/mmu.c:4097 direct_page_fault+0x27d/0x1d70 arch/x86/kvm/mmu/mmu.c:4146 kvm_mmu_do_page_fault arch/x86/kvm/mmu.h:115 [inline] kvm_mmu_page_fault+0x187/0x15d0 arch/x86/kvm/mmu/mmu.c:5446 vmx_handle_exit+0x2b8/0x1700 arch/x86/kvm/vmx/vmx.c:5980 vcpu_enter_guest+0xfea/0x59d0 arch/x86/kvm/x86.c:8481 vcpu_run arch/x86/kvm/x86.c:8544 [inline] kvm_arch_vcpu_ioctl_run+0x3fb/0x16e0 arch/x86/kvm/x86.c:8766 kvm_vcpu_ioctl+0x493/0xe60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3138 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd4c6ed7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e7fc0 RCX: 000000000045ca29 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000008 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003c6 R14: 00000000004c6703 R15: 00007fd4c6ed86d4 Allocated by task 8631: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:757 [inline] kvzalloc include/linux/mm.h:765 [inline] kvm_dup_memslots arch/x86/kvm/../../../virt/kvm/kvm_main.c:1101 [inline] kvm_set_memslot+0x115/0x1530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 __kvm_set_memory_region+0xcf7/0x1320 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1300 kvm_set_memory_region+0x29/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1321 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline] kvm_vm_ioctl+0x678/0x2400 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 7232: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 skb_free_head+0x8b/0xa0 net/core/skbuff.c:590 skb_release_data+0x617/0x8a0 net/core/skbuff.c:610 skb_release_all+0x46/0x60 net/core/skbuff.c:664 __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:837 [inline] consume_skb+0xf3/0x400 net/core/skbuff.c:831 netlink_broadcast_filtered+0x34f/0xd40 net/netlink/af_netlink.c:1513 netlink_broadcast net/netlink/af_netlink.c:1535 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0x90/0x250 net/netlink/af_netlink.c:2512 inet6_ifinfo_notify+0xc9/0x150 net/ipv6/addrconf.c:5966 addrconf_notify+0x523/0x2310 net/ipv6/addrconf.c:3627 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1948 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] __dev_notify_flags+0x121/0x2c0 net/core/dev.c:8182 dev_change_flags+0x100/0x160 net/core/dev.c:8220 do_setlink+0xa1c/0x3680 net/core/rtnetlink.c:2598 __rtnl_newlink+0xad5/0x1590 net/core/rtnetlink.c:3266 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3391 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x220/0x330 net/socket.c:2000 __do_sys_sendto net/socket.c:2012 [inline] __se_sys_sendto net/socket.c:2008 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2008 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff8880a1606000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1128 bytes inside of 2048-byte region [ffff8880a1606000, ffff8880a1606800) The buggy address belongs to the page: page:ffffea0002858180 refcount:1 mapcount:0 mapping:00000000ed665ebc index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00029cf588 ffffea00027969c8 ffff8880aa000e00 raw: 0000000000000000 ffff8880a1606000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a1606300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a1606380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a1606400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ^ ffff8880a1606480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a1606500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================