================================================================== BUG: KASAN: use-after-free in predicate_parse kernel/trace/trace_events_filter.c:557 [inline] BUG: KASAN: use-after-free in process_preds+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1509 Write of size 4 at addr ffff8801d783cff0 by task syz-executor0/25628 CPU: 1 PID: 25628 Comm: syz-executor0 Not tainted 4.17.0+ #39 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_store4_noabort+0x17/0x20 mm/kasan/report.c:437 predicate_parse kernel/trace/trace_events_filter.c:557 [inline] process_preds+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1509 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1717 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2042 perf_event_set_filter+0x22e/0x1230 kernel/events/core.c:9078 _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/0x16f0 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:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455b29 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f541202fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f54120306d4 RCX: 0000000000455b29 RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c4f20 R14: 00000000004cc670 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea00075e0f00 count:0 mapcount:-128 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 ffffea00065d00c8 ffffea0006c3e188 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d783ce80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8801d783cf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8801d783cf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8801d783d000: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801d783d080: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ==================================================================