==================================================================
BUG: KASAN: slab-out-of-bounds in predicate_parse kernel/trace/trace_events_filter.c:557 [inline]
BUG: KASAN: slab-out-of-bounds in process_preds+0x1958/0x19b0 kernel/trace/trace_events_filter.c:1505
Write of size 4 at addr ffff8801cb5fbaf0 by task syzkaller752392/4531

CPU: 0 PID: 4531 Comm: syzkaller752392 Not tainted 4.16.0+ #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412
 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:437
 predicate_parse kernel/trace/trace_events_filter.c:557 [inline]
 process_preds+0x1958/0x19b0 kernel/trace/trace_events_filter.c:1505
 create_filter+0x1a8/0x370 kernel/trace/trace_events_filter.c:1714
 ftrace_profile_set_filter+0x109/0x2b0 kernel/trace/trace_events_filter.c:2042
 perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9064
 _perf_ioctl+0x84c/0x1650 kernel/events/core.c:5056
 perf_ioctl+0x59/0x80 kernel/events/core.c:5107
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x1650 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 SYSC_ioctl fs/ioctl.c:708 [inline]
 SyS_ioctl+0x24/0x30 fs/ioctl.c:706
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x43fde9
RSP: 002b:00007fff4707bc18 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fde9
RDX: 00000000200000c0 RSI: 0000000040082406 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401710
R13: 00000000004017a0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 2371:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc mm/slab.c:3718 [inline]
 __kmalloc+0x14e/0x760 mm/slab.c:3727
 kmalloc include/linux/slab.h:517 [inline]
 kzalloc include/linux/slab.h:701 [inline]
 ext4_htree_store_dirent+0x8b/0x5a0 fs/ext4/dir.c:454
 htree_dirblock_to_tree+0x563/0xac0 fs/ext4/namei.c:1020
 ext4_htree_fill_tree+0x404/0xd40 fs/ext4/namei.c:1097
 ext4_dx_readdir fs/ext4/dir.c:578 [inline]
 ext4_readdir+0x1c82/0x3bb0 fs/ext4/dir.c:123
 iterate_dir+0x4b0/0x5d0 fs/readdir.c:51
 SYSC_getdents fs/readdir.c:231 [inline]
 SyS_getdents+0x22c/0x450 fs/readdir.c:212
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 2371:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 free_rb_tree_fname+0x85/0xe0 fs/ext4/dir.c:406
 ext4_htree_free_dir_info fs/ext4/dir.c:428 [inline]
 ext4_release_dir+0x44/0x60 fs/ext4/dir.c:626
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x2bd/0x310 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x792/0x9d0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801cb5fba80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 48 bytes to the right of
 64-byte region [ffff8801cb5fba80, ffff8801cb5fbac0)
The buggy address belongs to the page:
page:ffffea00072d7ec0 count:1 mapcount:0 mapping:ffff8801cb5fb000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801cb5fb000 0000000000000000 0000000100000020
raw: ffffea0007393c20 ffffea000738d220 ffff8801dac00340 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cb5fb980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801cb5fba00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff8801cb5fba80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                                             ^
 ffff8801cb5fbb00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff8801cb5fbb80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================