ip (2799) used greatest stack depth: 24296 bytes left
ip (3218) used greatest stack depth: 24232 bytes left
audit: type=1400 audit(1536376877.821:10): avc:  denied  { prog_load } for  pid=5153 comm="syz-executor4" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
==================================================================
BUG: KASAN: use-after-free in _copy_to_user+0x9a/0xc0 lib/usercopy.c:27
Read of size 1368 at addr ffff8801c0bffffc by task syz-executor4/5156

CPU: 0 PID: 5156 Comm: syz-executor4 Not tainted 4.14.68+ #4
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 _copy_to_user+0x9a/0xc0 lib/usercopy.c:27
 copy_to_user include/linux/uaccess.h:155 [inline]
 bpf_test_finish.isra.0+0xc8/0x190 net/bpf/test_run.c:59
 bpf_prog_test_run_skb+0x4d0/0x8c0 net/bpf/test_run.c:144
 bpf_prog_test_run kernel/bpf/syscall.c:1330 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1602 [inline]
 SyS_bpf+0x79d/0x3640 kernel/bpf/syscall.c:1547
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457099
RSP: 002b:00007f5351cfec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5351cff6d4 RCX: 0000000000457099
RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cb8c0 R14: 00000000004c3289 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea000702ffc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: ffffea000702ffe0 ffffea000702ffe0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c0bffe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8801c0bfff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8801c0bfff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff8801c0c00000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c0c00080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================