==================================================================
BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x9a/0xc0 lib/usercopy.c:27
Read of size 337 at addr ffff880181a6fffd by task syz-executor1/11457

CPU: 0 PID: 11457 Comm: syz-executor1 Not tainted 4.14.78+ #24
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: 0033:0x457569
RSP: 002b:00007f83eeff9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000028 RSI: 0000000020001280 RDI: 000000000000000a
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f83eeffa6d4
R13: 00000000004bd892 R14: 00000000004cc208 R15: 00000000ffffffff

Allocated by task 11406:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2723 [inline]
 slab_alloc mm/slub.c:2731 [inline]
 kmem_cache_alloc+0xe4/0x2b0 mm/slub.c:2736
 getname_flags+0xc4/0x540 fs/namei.c:138
 do_sys_open+0x1ea/0x580 fs/open.c:1065
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 11406:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:524
 slab_free_hook mm/slub.c:1389 [inline]
 slab_free_freelist_hook mm/slub.c:1410 [inline]
 slab_free mm/slub.c:2966 [inline]
 kmem_cache_free+0x12d/0x350 mm/slub.c:2988
 putname+0xcf/0x100 fs/namei.c:259
 do_sys_open+0x2bb/0x580 fs/open.c:1080
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff880181a6e600
 which belongs to the cache names_cache of size 4096
The buggy address is located 2557 bytes to the right of
 4096-byte region [ffff880181a6e600, ffff880181a6f600)
The buggy address belongs to the page:
page:ffffea0006069a00 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x4000000000008100(slab|head)
raw: 4000000000008100 0000000000000000 0000000000000000 0000000100070007
raw: dead000000000100 dead000000000200 ffff8801da97e000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880181a6fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff880181a6ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880181a6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff880181a70000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff880181a70080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
audit: type=1326 audit(2000000010.750:86150): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=11381 comm="syz-executor0" exe="/root/syz-executor0" sig=0 arch=c000003e syscall=228 compat=0 ip=0x45a3ca code=0x7ff00000