================================================================== BUG: KASAN: slab-out-of-bounds in __ptr_ring_produce include/linux/ptr_ring.h:107 [inline] BUG: KASAN: slab-out-of-bounds in ptr_ring_produce include/linux/ptr_ring.h:130 [inline] BUG: KASAN: slab-out-of-bounds in skb_array_produce include/linux/skb_array.h:48 [inline] BUG: KASAN: slab-out-of-bounds in tun_net_xmit+0x10b8/0x1180 drivers/net/tun.c:920 Read of size 8 at addr ffff8801d2ab2080 by task kworker/1:0/18 CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.9.141+ #23 Workqueue: ipv6_addrconf addrconf_dad_work ffff8801da717278 ffffffff81b42e79 ffffea00074aac80 ffff8801d2ab2080 0000000000000000 ffff8801d2ab2080 ffff8801d1fe5a88 ffff8801da7172b0 ffffffff815009b8 ffff8801d2ab2080 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] __ptr_ring_produce include/linux/ptr_ring.h:107 [inline] [] ptr_ring_produce include/linux/ptr_ring.h:130 [inline] [] skb_array_produce include/linux/skb_array.h:48 [inline] [] tun_net_xmit+0x10b8/0x1180 drivers/net/tun.c:920 [] __netdev_start_xmit include/linux/netdevice.h:4069 [inline] [] netdev_start_xmit include/linux/netdevice.h:4078 [inline] [] xmit_one net/core/dev.c:2977 [inline] [] dev_hard_start_xmit+0x197/0x8b0 net/core/dev.c:2993 [] sch_direct_xmit+0x2b3/0x580 net/sched/sch_generic.c:182 [] __dev_xmit_skb net/core/dev.c:3173 [inline] [] __dev_queue_xmit+0x152e/0x1b90 net/core/dev.c:3441 [] dev_queue_xmit+0x17/0x20 net/core/dev.c:3506 [] neigh_direct_output+0x15/0x20 net/core/neighbour.c:1365 [] dst_neigh_output include/net/dst.h:470 [inline] [] ip6_finish_output2+0xb0e/0x1d10 net/ipv6/ip6_output.c:119 [] ip6_finish_output+0x334/0x980 net/ipv6/ip6_output.c:145 [] NF_HOOK_COND include/linux/netfilter.h:246 [inline] [] ip6_output+0x1ea/0x6d0 net/ipv6/ip6_output.c:162 [] dst_output include/net/dst.h:507 [inline] [] NF_HOOK_THRESH include/linux/netfilter.h:232 [inline] [] NF_HOOK include/linux/netfilter.h:255 [inline] [] mld_sendpack+0xa1e/0xf80 net/ipv6/mcast.c:1659 [] mld_send_initial_cr.part.15+0x103/0x150 net/ipv6/mcast.c:2077 [] mld_send_initial_cr net/ipv6/mcast.c:2090 [inline] [] ipv6_mc_dad_complete+0x175/0x1c0 net/ipv6/mcast.c:2084 [] addrconf_dad_completed+0x500/0x950 net/ipv6/addrconf.c:4022 [] addrconf_dad_begin net/ipv6/addrconf.c:3819 [inline] [] addrconf_dad_work+0x755/0xca0 net/ipv6/addrconf.c:3919 [] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092 [] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Allocated by task 26016: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:609 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:594 __kmalloc+0x12f/0x310 mm/slub.c:3741 kmalloc_array include/linux/slab.h:582 [inline] kcalloc include/linux/slab.h:593 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:356 [inline] ptr_ring_resize_multiple include/linux/ptr_ring.h:445 [inline] skb_array_resize_multiple include/linux/skb_array.h:169 [inline] tun_queue_resize drivers/net/tun.c:2523 [inline] tun_device_event+0x3e0/0xa00 drivers/net/tun.c:2541 notifier_call_chain+0xb4/0x1d0 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+0x55/0x70 net/core/dev.c:1647 call_netdevice_notifiers+0x70/0xa0 net/core/dev.c:1663 do_setlink+0xc55/0x2ef0 net/core/rtnetlink.c:2052 rtnl_group_changelink net/core/rtnetlink.c:2423 [inline] rtnl_newlink+0xbd0/0x1550 net/core/rtnetlink.c:2571 rtnetlink_rcv_msg+0x49c/0x650 net/core/rtnetlink.c:4078 netlink_rcv_skb+0x145/0x370 net/netlink/af_netlink.c:2365 rtnetlink_rcv+0x2a/0x40 net/core/rtnetlink.c:4084 netlink_unicast_kernel net/netlink/af_netlink.c:1285 [inline] netlink_unicast+0x4d8/0x6d0 net/netlink/af_netlink.c:1311 netlink_sendmsg+0x694/0xc30 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:648 [inline] sock_sendmsg+0xbb/0x110 net/socket.c:658 ___sys_sendmsg+0x6fc/0x840 net/socket.c:1982 __sys_sendmsg+0xd9/0x190 net/socket.c:2016 C_SYSC_sendmsg net/compat.c:736 [inline] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:734 do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Freed by task 2082: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xfb/0x310 mm/slub.c:3878 kvfree+0x4b/0x60 mm/util.c:356 __vunmap+0x295/0x400 mm/vmalloc.c:1518 vfree+0x50/0x110 mm/vmalloc.c:1552 xt_compat_flush_offsets+0x62/0x130 net/netfilter/x_tables.c:525 compat_get_entries net/ipv4/netfilter/ip_tables.c:1649 [inline] compat_do_ipt_get_ctl+0x329/0x8e0 net/ipv4/netfilter/ip_tables.c:1674 compat_nf_sockopt net/netfilter/nf_sockopt.c:138 [inline] compat_nf_getsockopt+0x8e/0x130 net/netfilter/nf_sockopt.c:162 compat_ip_getsockopt+0x147/0x1c0 net/ipv4/ip_sockglue.c:1589 inet_csk_compat_getsockopt+0x97/0x120 net/ipv4/inet_connection_sock.c:904 compat_tcp_getsockopt+0x3d/0x70 net/ipv4/tcp.c:3117 compat_sock_common_getsockopt+0xb4/0x150 net/core/sock.c:2676 C_SYSC_getsockopt net/compat.c:520 [inline] compat_SyS_getsockopt+0x16a/0x560 net/compat.c:503 C_SYSC_socketcall net/compat.c:854 [inline] compat_SyS_socketcall+0x580/0x680 net/compat.c:785 do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 The buggy address belongs to the object at ffff8801d2ab2078 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of 8-byte region [ffff8801d2ab2078, ffff8801d2ab2080) The buggy address belongs to the page: page:ffffea00074aac80 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000080(slab) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d2ab1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801d2ab2000: fb fc fc fb fc fc fb fc fc fb fc fc 00 fc fc 00 >ffff8801d2ab2080: fc fc fb fc fc fb fc fc fb fc fc fb fc fc fb fc ^ ffff8801d2ab2100: fc 04 fc fc fb fc fc fb fc fc fb fc fc fb fc fc ffff8801d2ab2180: fb fc fc fb fc fc fb fc fc fb fc fc fb fc fc 04 ==================================================================