IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: filesystem on './file0' not supported as upperdir ================================================================== netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1929 Read of size 8 at addr ffff888092b01c68 by task syz-executor.2/20453 CPU: 0 PID: 20453 Comm: syz-executor.2 Not tainted 4.14.182-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+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2b9 mm/kasan/report.c:393 __read_once_size include/linux/compiler.h:183 [inline] dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1929 xmit_one net/core/dev.c:3005 [inline] dev_hard_start_xmit+0xa8/0x880 net/core/dev.c:3025 __dev_queue_xmit+0x1dce/0x25a0 net/core/dev.c:3525 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip6_finish_output2+0xdab/0x21b0 net/ipv6/ip6_output.c:120 ip6_finish_output+0x702/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] mld_sendpack+0x667/0xe90 net/ipv6/mcast.c:1660 mld_send_cr net/ipv6/mcast.c:1956 [inline] mld_ifc_timer_expire+0x3b0/0x7b0 net/ipv6/mcast.c:2455 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers+0x233/0x4d0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1636 [inline] run_timer_softirq+0x1d8/0x5b0 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5f0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192 RSP: 0018:ffff88821237f540 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0f62c99 RBX: 0000000000000282 RCX: 1ffff11011ea0944 RDX: dffffc0000000000 RSI: ffff88808f504a28 RDI: 0000000000000282 RBP: ffffffff87b88120 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0000374620 R13: 0000000000000000 R14: 000000000000004c R15: ffffea00009521c0 __rcu_read_unlock+0x158/0x160 kernel/rcu/update.c:260 rcu_read_unlock include/linux/rcupdate.h:684 [inline] __unlock_page_memcg+0x54/0x100 mm/memcontrol.c:1716 mark_buffer_dirty+0x30f/0x480 fs/buffer.c:1175 __block_write_begin_int+0x79c/0x1000 fs/buffer.c:2050 __block_write_begin fs/buffer.c:2088 [inline] block_page_mkwrite+0x1d5/0x2b0 fs/buffer.c:2551 ext4_page_mkwrite+0xa6a/0xfd0 fs/ext4/inode.c:6158 do_page_mkwrite+0xd4/0x2e0 mm/memory.c:2383 wp_page_shared mm/memory.c:2675 [inline] do_wp_page+0x830/0x1dc0 mm/memory.c:2775 handle_pte_fault mm/memory.c:4005 [inline] __handle_mm_fault+0x1ee8/0x3700 mm/memory.c:4113 handle_mm_fault+0x306/0x794 mm/memory.c:4150 __do_page_fault+0x578/0xb50 arch/x86/mm/fault.c:1442 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff88821237fb60 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000500 RDX: 0000000000001000 RSI: ffff888092775b00 RDI: 0000000020054000 RBP: 0000000020053500 R08: ffffed10124eec00 R09: 0000000000000000 R10: ffffed10124eebff R11: ffff888092775fff R12: ffff888092775000 R13: 00007ffffffff000 R14: 0000000020054500 R15: ffff88821237fde0 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:112 [inline] copyout+0x99/0xc0 lib/iov_iter.c:137 copy_page_to_iter_iovec lib/iov_iter.c:206 [inline] copy_page_to_iter+0x32a/0xc90 lib/iov_iter.c:723 pipe_to_user+0xa8/0x160 fs/splice.c:1237 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x332/0x740 fs/splice.c:626 vmsplice_to_user+0x197/0x1c0 fs/splice.c:1272 SYSC_vmsplice fs/splice.c:1353 [inline] SyS_vmsplice+0x12a/0x150 fs/splice.c:1334 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca69 RSP: 002b:00007f6dbc3ddc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000116 RAX: ffffffffffffffda RBX: 000000000050a3c0 RCX: 000000000045ca69 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000c55 R14: 00000000004cea35 R15: 00007f6dbc3de6d4 Allocated by task 20463: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1467 sk_alloc+0x36/0xd30 net/core/sock.c:1521 packet_create+0xf5/0x7e0 net/packet/af_packet.c:3283 __sock_create+0x2f2/0x620 net/socket.c:1275 sock_create net/socket.c:1315 [inline] SYSC_socket net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 net/socket.c:1325 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 20452: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xaf/0x190 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 sk_prot_free net/core/sock.c:1504 [inline] __sk_destruct+0x4f5/0x640 net/core/sock.c:1581 sk_destruct+0x97/0xc0 net/core/sock.c:1596 __sk_free+0x4c/0x220 net/core/sock.c:1604 sk_free+0x2b/0x40 net/core/sock.c:1615 sock_put include/net/sock.h:1658 [inline] packet_release+0x8c4/0xb70 net/packet/af_packet.c:3112 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x113/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff888092b01480 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2024 bytes inside of 2048-byte region [ffff888092b01480, ffff888092b01c80) The buggy address belongs to the page: page:ffffea00024ac000 count:1 mapcount:0 mapping:ffff888092b00380 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888092b00380 0000000000000000 0000000100000003 raw: ffffea0002204b20 ffffea00011d5620 ffff8880aa800c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888092b01b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888092b01b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888092b01c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888092b01c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888092b01d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================