IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
device lo entered promiscuous mode
==================================================================
BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry+0x2de/0x320 fs/ext4/dir.c:69
Read of size 2 at addr ffff88018a380002 by task syz-executor5/9196

CPU: 1 PID: 9196 Comm: syz-executor5 Not tainted 4.16.0-rc7+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23c/0x360 mm/kasan/report.c:412
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
 __ext4_check_dir_entry+0x2de/0x320 fs/ext4/dir.c:69
 ext4_readdir+0xd00/0x3600 fs/ext4/dir.c:237
 iterate_dir+0x1ca/0x530 fs/readdir.c:51
 SYSC_getdents64 fs/readdir.c:314 [inline]
 SyS_getdents64+0x221/0x420 fs/readdir.c:295
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454e79
RSP: 002b:00007fb141757c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fb1417586d4 RCX: 0000000000454e79
RDX: 00000000000000bc RSI: 0000000020000080 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000000a9 R14: 00000000006f3078 R15: 0000000000000000

Allocated by task 9072:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552
 __do_kmalloc_node mm/slab.c:3670 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3677
 kmalloc_node include/linux/slab.h:554 [inline]
 kvmalloc_node+0x64/0xd0 mm/util.c:419
 kvmalloc include/linux/mm.h:541 [inline]
 kvzalloc include/linux/mm.h:549 [inline]
 __kvm_set_memory_region+0x206b/0x24c0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:998
 kvm_set_memory_region+0x2e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1060
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1072 [inline]
 kvm_vm_ioctl+0x119a/0x1cf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2959
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 9072:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3486 [inline]
 kfree+0xd9/0x260 mm/slab.c:3801
 kvfree+0x36/0x60 mm/util.c:438
 __kvm_set_memory_region+0x1740/0x24c0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1042
 kvm_set_memory_region+0x2e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1060
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1072 [inline]
 kvm_vm_ioctl+0x119a/0x1cf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2959
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff88018a385dc0
 which belongs to the cache kmalloc-65536 of size 65536
The buggy address is located 23998 bytes to the left of
 65536-byte region [ffff88018a385dc0, ffff88018a395dc0)
The buggy address belongs to the page:
page:ffffea000628e000 count:1 mapcount:0 mapping:ffff88018a385dc0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff88018a385dc0 0000000000000000 0000000100000001
raw: ffffea0006286820 ffffea000628e820 ffff8801dac02500 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88018a37ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88018a37ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88018a380000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88018a380080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88018a380100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================