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BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x9a/0xc0 lib/usercopy.c:27
Read of size 620 at addr ffff88019c69fff3 by task syz-executor0/29986

CPU: 1 PID: 29986 Comm: syz-executor0 Not tainted 4.14.74+ #17
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: 0033:0x457579
RSP: 002b:00007f671d3cbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 0000000000000028 RSI: 0000000020000100 RDI: 000000000000000a
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f671d3cc6d4
R13: 00000000004bd8a6 R14: 00000000004cc208 R15: 00000000ffffffff

Allocated by task 28749:
 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
 kmem_cache_alloc_trace+0x138/0x300 mm/slub.c:2750
 kmalloc include/linux/slab.h:488 [inline]
 perf_event_mmap_event kernel/events/core.c:6999 [inline]
 perf_event_mmap+0x447/0xc30 kernel/events/core.c:7193
 mprotect_fixup+0x3b2/0x800 mm/mprotect.c:431
 do_mprotect_pkey mm/mprotect.c:541 [inline]
 SYSC_mprotect mm/mprotect.c:566 [inline]
 SyS_mprotect+0x30a/0x610 mm/mprotect.c:563
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 28749:
 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]
 kfree+0xf5/0x310 mm/slub.c:3897
 perf_event_mmap_event kernel/events/core.c:7079 [inline]
 perf_event_mmap+0x83a/0xc30 kernel/events/core.c:7193
 mprotect_fixup+0x3b2/0x800 mm/mprotect.c:431
 do_mprotect_pkey mm/mprotect.c:541 [inline]
 SYSC_mprotect mm/mprotect.c:566 [inline]
 SyS_mprotect+0x30a/0x610 mm/mprotect.c:563
 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 ffff88019c69e600
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 2547 bytes to the right of
 4096-byte region [ffff88019c69e600, ffff88019c69f600)
The buggy address belongs to the page:
page:ffffea000671a600 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x4000000000008100(slab|head)
raw: 4000000000008100 0000000000000000 0000000000000000 0000000100070007
raw: 0000000000000000 0000000400000001 ffff8801da802600 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88019c69fe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88019c69ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88019c69ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff88019c6a0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88019c6a0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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