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BUG: KASAN: vmalloc-out-of-bounds in __do_cpuid_func_emulated arch/x86/kvm/cpuid.c:323 [inline]
BUG: KASAN: vmalloc-out-of-bounds in do_cpuid_func arch/x86/kvm/cpuid.c:814 [inline]
BUG: KASAN: vmalloc-out-of-bounds in do_cpuid_func arch/x86/kvm/cpuid.c:810 [inline]
BUG: KASAN: vmalloc-out-of-bounds in kvm_dev_ioctl_get_cpuid+0xacc/0xb47 arch/x86/kvm/cpuid.c:891
Write of size 4 at addr ffffc90002a6c050 by task syz-executor.3/9223

CPU: 0 PID: 9223 Comm: syz-executor.3 Not tainted 5.4.0-next-20191129-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:638
 __asan_report_store4_noabort+0x17/0x20 mm/kasan/generic_report.c:139
 __do_cpuid_func_emulated arch/x86/kvm/cpuid.c:323 [inline]
 do_cpuid_func arch/x86/kvm/cpuid.c:814 [inline]
 do_cpuid_func arch/x86/kvm/cpuid.c:810 [inline]
 kvm_dev_ioctl_get_cpuid+0xacc/0xb47 arch/x86/kvm/cpuid.c:891
 kvm_arch_dev_ioctl+0x300/0x4b0 arch/x86/kvm/x86.c:3387
 kvm_dev_ioctl+0x127/0x17d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3593
 vfs_ioctl fs/ioctl.c:47 [inline]
 file_ioctl fs/ioctl.c:545 [inline]
 do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a679
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6c72421c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020000080 RSI: 00000000c008ae09 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6c724226d4
R13: 00000000004c3b7d R14: 00000000004d8510 R15: 00000000ffffffff


Memory state around the buggy address:
 ffffc90002a6bf00: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffc90002a6bf80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
>ffffc90002a6c000: 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9
                                                 ^
 ffffc90002a6c080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffc90002a6c100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
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