================================================================== 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+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1509 Write of size 4 at addr ffff8801d2ef4270 by task syz-executor2/5060 CPU: 1 PID: 5060 Comm: syz-executor2 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: 0033:0x455a99 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:00007fab550acc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fab550ad6d4 RCX: 0000000000455a99 RDX: 0000000020001240 RSI: 0000000040082406 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c4e70 R14: 00000000004cc5d0 R15: 0000000000000000 Allocated by task 22073: 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:513 [inline] kzalloc include/linux/slab.h:706 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:347 [inline] ipv6_add_dev+0x598/0x1380 net/ipv6/addrconf.c:402 addrconf_notify+0x9fb/0x27e0 net/ipv6/addrconf.c:3435 notifier_call_chain+0x178/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1735 call_netdevice_notifiers net/core/dev.c:1753 [inline] register_netdevice+0xb95/0x11c0 net/core/dev.c:8028 register_netdev+0x30/0x50 net/core/dev.c:8114 br_add_bridge+0x9b/0xf0 net/bridge/br_if.c:399 br_ioctl_deviceless_stub+0x99c/0xad0 net/bridge/br_ioctl.c:378 sock_ioctl+0x2d5/0x680 net/socket.c:1064 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 Freed by task 4578: 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 __vunmap+0x333/0x460 mm/vmalloc.c:1532 vfree+0x68/0x100 mm/vmalloc.c:1593 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:869 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1026 [inline] do_ipt_get_ctl+0xa1f/0xc00 net/ipv4/netfilter/ip_tables.c:1702 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x1ec/0x2a0 net/ipv4/ip_sockglue.c:1574 tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3534 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3012 __sys_getsockopt+0x1a5/0x370 net/socket.c:1984 __do_sys_getsockopt net/socket.c:1995 [inline] __se_sys_getsockopt net/socket.c:1992 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1992 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d2ef4200 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801d2ef4200, ffff8801d2ef4240) The buggy address belongs to the page: page:ffffea00074bbd00 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0007630688 ffffea00075a9d08 ffff8801da800340 raw: 0000000000000000 ffff8801d2ef4000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d2ef4100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8801d2ef4180: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff8801d2ef4200: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8801d2ef4280: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801d2ef4300: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================