syzbot

IPVS: ftp: loaded support on port[0] = 21
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BUG: KASAN: slab-out-of-bounds in dst_input include/net/dst.h:450 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_rcv_finish+0x2ec/0x320 net/ipv6/ip6_input.c:76
Read of size 8 at addr ffff88808a25ce2c by task ksoftirqd/0/9

CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.0.0-rc6+ #82
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:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x2ec/0x320 net/ipv6/ip6_input.c:76
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:654 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:646
 smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 9:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:496 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
 kasan_kmalloc mm/kasan/common.c:504 [inline]
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411
 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543
 dst_alloc+0x10e/0x1d0 net/core/dst.c:105
 ip6_dst_alloc+0x34/0xa0 net/ipv6/route.c:355
 ip6_rt_pcpu_alloc net/ipv6/route.c:1223 [inline]
 rt6_make_pcpu_route net/ipv6/route.c:1253 [inline]
 ip6_pol_route+0x672/0xf00 net/ipv6/route.c:1895
 ip6_pol_route_input+0x65/0x80 net/ipv6/route.c:1911
 fib6_rule_lookup+0x128/0x560 net/ipv6/fib6_rules.c:118
 ip6_route_input_lookup+0xb7/0xd0 net/ipv6/route.c:1923
 ip6_route_input+0x5e6/0x9e0 net/ipv6/route.c:2058
 ip6_rcv_finish_core.isra.0+0x174/0x590 net/ipv6/ip6_input.c:63
 ip6_rcv_finish+0x17d/0x320 net/ipv6/ip6_input.c:74
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ipv6_rcv+0x10e/0x420 net/ipv6/ip6_input.c:272
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:292

Freed by task 9:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466
 __cache_free mm/slab.c:3487 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3749
 dst_destroy+0x2a0/0x3c0 net/core/dst.c:141
 dst_destroy_rcu+0x16/0x19 net/core/dst.c:154
 __rcu_reclaim kernel/rcu/rcu.h:240 [inline]
 rcu_do_batch kernel/rcu/tree.c:2452 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline]
 rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754
 __do_softirq+0x266/0x95a kernel/softirq.c:292

The buggy address belongs to the object at ffff88808a25cd00
 which belongs to the cache ip6_dst_cache of size 224
The buggy address is located 76 bytes to the right of
 224-byte region [ffff88808a25cd00, ffff88808a25cde0)
The buggy address belongs to the page:
page:ffffea0002289700 count:1 mapcount:0 mapping:ffff888216bd8cc0 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000269b048 ffffea00020b4dc8 ffff888216bd8cc0
raw: 0000000000000000 ffff88808a25c080 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808a25cd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808a25cd80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff88808a25ce00: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                                  ^
 ffff88808a25ce80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808a25cf00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
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