R13: 00007f1d8ed54bc8 R14: 00000000004b759b R15: 0000000000000000
==================================================================
BUG: KASAN: use-after-free in __fput+0x6b1/0x7f0 fs/file_table.c:212
Read of size 2 at addr ffff8801cf52caf0 by task syz-executor3/919

CPU: 0 PID: 919 Comm: syz-executor3 Not tainted 4.15.0-rc2+ #142
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+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
 __fput+0x6b1/0x7f0 fs/file_table.c:212
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x4529d9
RSP: 002b:00007f1d8ed54c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: fffffffffffffff4 RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000020f77ffc RSI: 00000000000089e2 RDI: 0000000000000016
RBP: 0000000000000354 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2080
R13: 0000000000000015 R14: 00007f1d8ed556d4 R15: ffffffffffffffff

Allocated by task 919:
 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:551
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3547
 sock_alloc_inode+0x70/0x300 net/socket.c:250
 alloc_inode+0x65/0x180 fs/inode.c:208
 new_inode_pseudo+0x69/0x190 fs/inode.c:890
 sock_alloc+0x41/0x270 net/socket.c:565
 kcm_clone net/kcm/kcmsock.c:1637 [inline]
 kcm_ioctl+0x866/0x1610 net/kcm/kcmsock.c:1713
 sock_do_ioctl+0x65/0xb0 net/socket.c:960
 sock_ioctl+0x2c2/0x440 net/socket.c:1057
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x1f/0x96

Freed by task 919:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3491 [inline]
 kmem_cache_free+0x77/0x280 mm/slab.c:3749
 sock_destroy_inode+0x56/0x70 net/socket.c:280
 destroy_inode+0x15d/0x200 fs/inode.c:265
 evict+0x57e/0x920 fs/inode.c:570
 iput_final fs/inode.c:1515 [inline]
 iput+0x7b9/0xaf0 fs/inode.c:1542
 sock_release+0x168/0x1e0 net/socket.c:606
 sock_close+0x16/0x20 net/socket.c:1125
 __fput+0x333/0x7f0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96

The buggy address belongs to the object at ffff8801cf52cac0
 which belongs to the cache sock_inode_cache of size 1048
The buggy address is located 48 bytes inside of
 1048-byte region [ffff8801cf52cac0, ffff8801cf52ced8)
The buggy address belongs to the page:
page:00000000df9e12b2 count:1 mapcount:0 mapping:00000000da98f530 index:0xffff8801cf52cffd
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801cf52c140 ffff8801cf52cffd 0000000100000003
raw: ffffea0006782160 ffffea0007175620 ffff8801d9c72b40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cf52c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cf52ca00: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801cf52ca80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                             ^
 ffff8801cf52cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801cf52cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================