IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready 8021q: adding VLAN 0 to HW filter on device bond0 IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready ================================================================== BUG: KASAN: use-after-free in sock_net_uid include/net/sock.h:1732 [inline] BUG: KASAN: use-after-free in ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26 Read of size 4 at addr ffff8801c20be1a8 by task syzkaller417947/4238 CPU: 0 PID: 4238 Comm: syzkaller417947 Not tainted 4.16.0-rc3+ #331 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+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 sock_net_uid include/net/sock.h:1732 [inline] ip6_route_me_harder+0x9d8/0xc00 net/ipv6/netfilter.c:26 ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:63 [inline] ip6table_mangle_hook+0x636/0x920 net/ipv6/netfilter/ip6table_mangle.c:77 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline] nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483 nf_hook include/linux/netfilter.h:243 [inline] NF_HOOK include/linux/netfilter.h:286 [inline] ip6_xmit+0x10ec/0x2260 net/ipv6/ip6_output.c:277 tcp_v6_send_synack+0x57b/0xaa0 net/ipv6/tcp_ipv6.c:490 tcp_conn_request+0x26fd/0x3660 net/ipv4/tcp_input.c:6336 tcp_v6_conn_request+0x212/0x270 net/ipv6/tcp_ipv6.c:1021 tcp_rcv_state_process+0x8f5/0x4920 net/ipv4/tcp_input.c:5845 tcp_v6_do_rcv+0x739/0x1250 net/ipv6/tcp_ipv6.c:1331 tcp_v6_rcv+0x24a1/0x2d70 net/ipv6/tcp_ipv6.c:1510 ip6_input_finish+0x37e/0x17a0 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:288 [inline] ip6_input+0xdb/0x560 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish+0x297/0x8c0 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:288 [inline] ipv6_rcv+0xf38/0x1fb0 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4554 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4619 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4693 napi_frags_finish net/core/dev.c:5134 [inline] napi_gro_frags+0x58a/0xaf0 net/core/dev.c:5207 tun_get_user+0x2720/0x3810 drivers/net/tun.c:1939 tun_chr_write_iter+0xbd/0x1c0 drivers/net/tun.c:1984 call_write_iter include/linux/fs.h:1781 [inline] do_iter_readv_writev+0x55c/0x830 fs/read_write.c:653 do_iter_write+0x154/0x540 fs/read_write.c:932 vfs_writev+0x18a/0x340 fs/read_write.c:977 do_writev+0xfc/0x2a0 fs/read_write.c:1012 SYSC_writev fs/read_write.c:1085 [inline] SyS_writev+0x27/0x30 fs/read_write.c:1082 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x443150 RSP: 002b:00007ffefe0bdad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000001a RCX: 0000000000443150 RDX: 0000000000000001 RSI: 00007ffefe0bdaf0 RDI: 00000000000000fc RBP: 00000000004a4a9b R08: 0000000000000013 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffefe0bdc10 R13: 00000000004042a0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 2886: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541 dup_mmap kernel/fork.c:451 [inline] dup_mm kernel/fork.c:1233 [inline] copy_mm+0x8d7/0x131f kernel/fork.c:1287 copy_process.part.38+0x1f56/0x4b60 kernel/fork.c:1793 copy_process kernel/fork.c:1606 [inline] _do_fork+0x1f7/0xf70 kernel/fork.c:2087 SYSC_clone kernel/fork.c:2194 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2188 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 3429: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3743 remove_vma+0x162/0x1b0 mm/mmap.c:176 exit_mmap+0x311/0x500 mm/mmap.c:3049 __mmput kernel/fork.c:960 [inline] mmput+0x223/0x6d0 kernel/fork.c:981 exit_mm kernel/exit.c:544 [inline] do_exit+0x90a/0x1ad0 kernel/exit.c:852 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801c20be148 which belongs to the cache vm_area_struct of size 200 The buggy address is located 96 bytes inside of 200-byte region [ffff8801c20be148, ffff8801c20be210) The buggy address belongs to the page: page:ffffea0007082f80 count:1 mapcount:0 mapping:ffff8801c20be040 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801c20be040 0000000000000000 000000010000000f raw: ffffea00071deb60 ffffea0007158820 ffff8801da5c3840 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c20be080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c20be100: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb >ffff8801c20be180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c20be200: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb ffff8801c20be280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================