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BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:183 [inline]
BUG: KASAN: slab-out-of-bounds in perf_event_fd_array_release+0x435/0x480 kernel/bpf/arraymap.c:544
Read of size 8 at addr ffff8801c6906e40 by task syz-executor6/13228

CPU: 1 PID: 13228 Comm: syz-executor6 Not tainted 4.15.0-rc7+ #189
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_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:183 [inline]
 perf_event_fd_array_release+0x435/0x480 kernel/bpf/arraymap.c:544
 bpf_map_release+0x84/0xc0 kernel/bpf/syscall.c:257
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452cf9
RSP: 002b:0000000000a2fa08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000071bec8 RCX: 0000000000452cf9
RDX: 0000000000452cf9 RSI: 0000000000720d18 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000000000b6 R09: 00000000000010e6
R10: 0000000000720d10 R11: 0000000000000202 R12: 0000000000a2f9b0
R13: 000000000071bea0 R14: 0000000000000542 R15: 0000000000000007

Allocated by task 13243:
 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
 __do_kmalloc_node mm/slab.c:3672 [inline]
 __kmalloc_node+0x47/0x70 mm/slab.c:3679
 kmalloc_node include/linux/slab.h:541 [inline]
 bpf_map_area_alloc+0x32/0x80 kernel/bpf/syscall.c:123
 array_map_alloc+0x351/0xa00 kernel/bpf/arraymap.c:96
 fd_array_map_alloc+0x57/0x70 kernel/bpf/arraymap.c:341
 find_and_alloc_map kernel/bpf/syscall.c:105 [inline]
 map_create kernel/bpf/syscall.c:404 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1805 [inline]
 SyS_bpf+0x7f8/0x4400 kernel/bpf/syscall.c:1782
 entry_SYSCALL_64_fastpath+0x23/0x9a

Freed by task 8862:
 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:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 seq_release fs/seq_file.c:366 [inline]
 single_release+0x80/0xb0 fs/seq_file.c:602
 close_pdeo+0x14f/0x530 fs/proc/inode.c:165
 proc_reg_release+0x12b/0x170 fs/proc/inode.c:376
 __fput+0x327/0x7e0 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+0x98/0x9a

The buggy address belongs to the object at ffff8801c6906d40
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes to the right of
 256-byte region [ffff8801c6906d40, ffff8801c6906e40)
The buggy address belongs to the page:
page:ffffea00071a4180 count:1 mapcount:0 mapping:ffff8801c69060c0 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c69060c0 0000000000000000 000000010000000c
raw: ffffea000717e8e0 ffffea0007143220 ffff8801dac007c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c6906d00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff8801c6906d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801c6906e00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8801c6906e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c6906f00: 00 00 00 00 00 00 00 00 00 00 02 fc fc fc fc fc
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