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BUG: KASAN: slab-out-of-bounds in predicate_parse kernel/trace/trace_events_filter.c:562 [inline]
BUG: KASAN: slab-out-of-bounds in process_preds+0x1905/0x19d0 kernel/trace/trace_events_filter.c:1508
Read of size 4 at addr ffff880198494ff0 by task syz-executor1/30151

CPU: 1 PID: 30151 Comm: syz-executor1 Not tainted 4.17.0-rc6+ #36
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+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 predicate_parse kernel/trace/trace_events_filter.c:562 [inline]
 process_preds+0x1905/0x19d0 kernel/trace/trace_events_filter.c:1508
 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1716
 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2041
 perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9079
 _perf_ioctl+0x84c/0x15e0 kernel/events/core.c:5059
 perf_ioctl+0x59/0x80 kernel/events/core.c:5110
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
RSP: 002b:00007fa189882c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa1898836d4 RCX: 0000000000455a09
RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002eb R14: 00000000006f96a8 R15: 0000000000000000

Allocated by task 4565:
 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
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554
 kmem_cache_zalloc include/linux/slab.h:691 [inline]
 get_empty_filp+0x125/0x520 fs/file_table.c:122
 alloc_file+0x24/0x3e0 fs/file_table.c:163
 sock_alloc_file+0x1f3/0x4e0 net/socket.c:410
 sock_map_fd net/socket.c:437 [inline]
 __sys_socket+0x16f/0x250 net/socket.c:1359
 __do_sys_socket net/socket.c:1364 [inline]
 __se_sys_socket net/socket.c:1362 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1362
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 17:
 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]
 kmem_cache_free+0x86/0x2d0 mm/slab.c:3756
 file_free_rcu+0x6f/0x90 fs/file_table.c:49
 __rcu_reclaim kernel/rcu/rcu.h:178 [inline]
 rcu_do_batch kernel/rcu/tree.c:2675 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline]
 rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285

The buggy address belongs to the object at ffff880198494d40
 which belongs to the cache filp(108:syz5) of size 456
The buggy address is located 232 bytes to the right of
 456-byte region [ffff880198494d40, ffff880198494f08)
The buggy address belongs to the page:
page:ffffea0006612500 count:1 mapcount:0 mapping:ffff8801984940c0 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801984940c0 0000000000000000 0000000100000006
raw: ffffea00075242e0 ffffea0007634560 ffff8801aee15000 ffff8801b32d8300
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff8801b32d8300

Memory state around the buggy address:
 ffff880198494e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880198494f00: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff880198494f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff880198495000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff880198495080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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