IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered forwarding state IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready ================================================================== BUG: KASAN: use-after-free in _copy_to_user+0x84/0xb0 lib/usercopy.c:27 Read of size 931 at addr ffff88807e3ffff3 by task syz-executor.3/6800 CPU: 1 PID: 6800 Comm: syz-executor.3 Not tainted 4.14.162-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 print_address_description.cold.7+0x9/0x1c9 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.8+0x11a/0x2d3 mm/kasan/report.c:409 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 _copy_to_user+0x84/0xb0 lib/usercopy.c:27 copy_to_user include/linux/uaccess.h:155 [inline] bpf_test_finish.isra.5+0xd5/0x170 net/bpf/test_run.c:59 bpf_prog_test_run_skb+0x66d/0xbc0 net/bpf/test_run.c:144 bpf_prog_test_run kernel/bpf/syscall.c:1264 [inline] SYSC_bpf kernel/bpf/syscall.c:1526 [inline] SyS_bpf+0x97e/0x28d3 kernel/bpf/syscall.c:1475 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 kobject: 'tx-8' (ffff88808677e098): kobject_uevent_env RIP: 0033:0x459829 kobject: 'tx-8' (ffff88808677e098): fill_kobj_path: path = '/devices/virtual/net/bond0/queues/tx-8' RSP: 002b:00007f9a5174fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 RDX: 0000000000000028 RSI: 0000000020000140 RDI: 000000000000000a RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9a517506d4 R13: 00000000004bfb92 R14: 00000000004d1758 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea0001f8ffc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x1fffc0000000000() raw: 01fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: ffffea0001f8ffe0 ffffea0001f8ffe0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88807e3ffe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807e3fff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88807e3fff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ kobject: 'tx-9' (ffff88808677e218): kobject_add_internal: parent: 'queues', set: 'queues' ffff88807e400000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807e400080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================