================================================================== BUG: KASAN: slab-out-of-bounds in icmpv6_xrlim_allow+0x409/0x440 net/ipv6/icmp.c:216 Read of size 8 at addr ffff888084c8843f by task syz-executor.4/17767 CPU: 0 PID: 17767 Comm: syz-executor.4 Not tainted 5.2.0-rc2+ #12 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 icmpv6_xrlim_allow+0x409/0x440 net/ipv6/icmp.c:216 icmp6_send+0x1107/0x1e50 net/ipv6/icmp.c:540 icmpv6_send+0xec/0x230 net/ipv6/ip6_icmp.c:43 ip6_link_failure+0x2b/0x530 net/ipv6/route.c:2367 dst_link_failure include/net/dst.h:416 [inline] ip6_tnl_xmit+0x444/0x34f0 net/ipv6/ip6_tunnel.c:1227 ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1383 [inline] ip6_tnl_start_xmit+0x867/0x1ce0 net/ipv6/ip6_tunnel.c:1409 __netdev_start_xmit include/linux/netdevice.h:4410 [inline] netdev_start_xmit include/linux/netdevice.h:4424 [inline] xmit_one net/core/dev.c:3292 [inline] dev_hard_start_xmit+0x18a/0x950 net/core/dev.c:3308 __dev_queue_xmit+0x2a8e/0x36b0 net/core/dev.c:3881 dev_queue_xmit+0x18/0x20 net/core/dev.c:3914 neigh_direct_output+0x16/0x20 net/core/neighbour.c:1532 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x1034/0x2550 net/ipv6/ip6_output.c:120 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:146 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:156 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:179 dst_output include/net/dst.h:433 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] rawv6_send_hdrinc net/ipv6/raw.c:691 [inline] rawv6_sendmsg+0x1dcf/0x35e0 net/ipv6/raw.c:935 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:671 ___sys_sendmsg+0x803/0x920 net/socket.c:2292 __sys_sendmsg+0x105/0x1d0 net/socket.c:2330 __do_sys_sendmsg net/socket.c:2339 [inline] __se_sys_sendmsg net/socket.c:2337 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2337 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f230042ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f230042b6d4 R13: 00000000004c6ccc R14: 00000000004dbb30 R15: 00000000ffffffff Allocated by task 9295: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3326 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3488 dst_alloc+0x10e/0x200 net/core/dst.c:93 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:356 icmp6_dst_alloc+0x1a9/0x660 net/ipv6/route.c:2806 ndisc_send_skb+0xfc1/0x14a0 net/ipv6/ndisc.c:488 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:702 addrconf_dad_completed+0x32e/0xbb0 net/ipv6/addrconf.c:4197 addrconf_dad_begin net/ipv6/addrconf.c:3965 [inline] addrconf_dad_work+0xa12/0x1150 net/ipv6/addrconf.c:4067 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 16386: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3698 dst_destroy+0x29e/0x3c0 net/core/dst.c:129 dst_destroy_rcu+0x16/0x19 net/core/dst.c:142 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2092 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2310 [inline] rcu_core+0xba5/0x1500 kernel/rcu/tree.c:2291 __do_softirq+0x25c/0x94c kernel/softirq.c:293 The buggy address belongs to the object at ffff888084c88300 which belongs to the cache ip6_dst_cache of size 224 The buggy address is located 95 bytes to the right of 224-byte region [ffff888084c88300, ffff888084c883e0) The buggy address belongs to the page: page:ffffea0002132200 refcount:1 mapcount:0 mapping:ffff88809c333080 index:0xffff888084c886c0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00025ec988 ffffea000266f248 ffff88809c333080 raw: ffff888084c886c0 ffff888084c88080 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888084c88300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888084c88380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888084c88400: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff888084c88480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888084c88500: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================