================================================================== 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+0x3ecf/0x4160 kernel/trace/trace_events_filter.c:1509 Write of size 4 at addr ffff8801d45022f0 by task syz-executor6/30599 CPU: 1 PID: 30599 Comm: syz-executor6 Not tainted 4.18.0-rc1+ #109 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+0x1c9/0x2b4 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+0x3ecf/0x4160 kernel/trace/trace_events_filter.c:1509 create_filter+0x167/0x280 kernel/trace/trace_events_filter.c:1717 ftrace_profile_set_filter+0x135/0x2f0 kernel/trace/trace_events_filter.c:2042 perf_event_set_filter+0x251/0x1260 kernel/events/core.c:9078 _perf_ioctl+0x865/0x1600 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+0x1de/0x1720 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+0x1b9/0x820 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:00007fa9383dac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa9383db6d4 RCX: 0000000000455b29 RDX: 00000000200000c0 RSI: 0000000040082406 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c4f20 R14: 00000000004cc670 R15: 0000000000000000 Allocated by task 4542: 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:518 [inline] kzalloc include/linux/slab.h:707 [inline] ext4_htree_store_dirent+0x8b/0x5a0 fs/ext4/dir.c:454 htree_dirblock_to_tree+0x56b/0xae0 fs/ext4/namei.c:1020 ext4_htree_fill_tree+0x40c/0xd60 fs/ext4/namei.c:1097 ext4_dx_readdir fs/ext4/dir.c:578 [inline] ext4_readdir+0x1cac/0x3bd0 fs/ext4/dir.c:123 iterate_dir+0x4b0/0x5d0 fs/readdir.c:51 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4542: 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+0x35b/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x311/0x370 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d4502280 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801d4502280, ffff8801d45022c0) The buggy address belongs to the page: page:ffffea0007514080 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0005f0bbc8 ffffea00075aebc8 ffff8801da800340 raw: 0000000000000000 ffff8801d4502000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d4502180: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801d4502200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801d4502280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801d4502300: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801d4502380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================