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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 ffff8801cd4b1870 by task syzkaller618592/4522

CPU: 0 PID: 4522 Comm: syzkaller618592 Not tainted 4.16.0+ #17
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: 0033:0x43fdb9
RSP: 002b:00007ffe4453d468 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9
RDX: 0000000020000140 RSI: 0000000040082406 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004016e0
R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 2217:
 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
 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
 kmalloc include/linux/slab.h:512 [inline]
 call_modprobe kernel/kmod.c:80 [inline]
 __request_module+0x386/0xcdd kernel/kmod.c:171
 crypto_larval_lookup crypto/api.c:228 [inline]
 crypto_alg_mod_lookup+0x1c1/0x6b0 crypto/api.c:275
 crypto_find_alg+0xba/0xe0 crypto/api.c:499
 crypto_grab_spawn+0x4f/0xe0 crypto/algapi.c:630
 crypto_grab_skcipher+0x50/0x60 crypto/skcipher.c:942
 crypto_fpu_create+0x1ea/0x9f0 arch/x86/crypto/fpu.c:145
 cryptomgr_probe+0x6d/0x280 crypto/algboss.c:75
 kthread+0x345/0x410 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411

Freed by task 2217:
 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_modprobe_argv+0x74/0xa0 kernel/kmod.c:67
 call_usermodehelper_freeinfo kernel/umh.c:42 [inline]
 call_usermodehelper_exec+0x274/0x4f0 kernel/umh.c:458
 call_modprobe kernel/kmod.c:99 [inline]
 __request_module+0x4ba/0xcdd kernel/kmod.c:171
 crypto_larval_lookup crypto/api.c:228 [inline]
 crypto_alg_mod_lookup+0x1c1/0x6b0 crypto/api.c:275
 crypto_find_alg+0xba/0xe0 crypto/api.c:499
 crypto_grab_spawn+0x4f/0xe0 crypto/algapi.c:630
 crypto_grab_skcipher+0x50/0x60 crypto/skcipher.c:942
 crypto_fpu_create+0x1ea/0x9f0 arch/x86/crypto/fpu.c:145
 cryptomgr_probe+0x6d/0x280 crypto/algboss.c:75
 kthread+0x345/0x410 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411

The buggy address belongs to the object at ffff8801cd4b1800
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 48 bytes to the right of
 64-byte region [ffff8801cd4b1800, ffff8801cd4b1840)
The buggy address belongs to the page:
page:ffffea0007352c40 count:1 mapcount:0 mapping:ffff8801cd4b1000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801cd4b1000 0000000000000000 0000000100000020
raw: ffffea00073b1260 ffffea000735e960 ffff8801dac00340 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cd4b1700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8801cd4b1780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8801cd4b1800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                                             ^
 ffff8801cd4b1880: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
 ffff8801cd4b1900: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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