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BUG: KASAN: slab-out-of-bounds in fib6_nh_get_excptn_bucket+0x198/0x1b0 net/ipv6/route.c:1595
Read of size 8 at addr ffff88808f7b70f8 by task ksoftirqd/0/9

CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:638
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 fib6_nh_get_excptn_bucket+0x198/0x1b0 net/ipv6/route.c:1595
 fib6_nh_flush_exceptions+0x37/0x2d0 net/ipv6/route.c:1723
 fib6_nh_release+0x84/0x3a0 net/ipv6/route.c:3505
 fib6_info_destroy_rcu+0x197/0x220 net/ipv6/ip6_fib.c:174
 __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
 rcu_do_batch kernel/rcu/tree.c:2183 [inline]
 rcu_core+0x570/0x1540 kernel/rcu/tree.c:2408
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2417
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:603 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:595
 smpboot_thread_fn+0x6a3/0xa40 kernel/smpboot.c:165
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 7166:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:485
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:526
 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 fib6_info_alloc+0xb6/0x1b0 net/ipv6/ip6_fib.c:154
 ip6_route_info_create+0x2ff/0x1500 net/ipv6/route.c:3607
 ip6_route_add+0x27/0x110 net/ipv6/route.c:3699
 inet6_rtm_newroute+0x16c/0x180 net/ipv6/route.c:5267
 rtnetlink_rcv_msg+0x45e/0xaf0 net/core/rtnetlink.c:5422
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5440
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x58c/0x7d0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x8ee/0xe60 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:659
 ____sys_sendmsg+0x753/0x880 net/socket.c:2330
 ___sys_sendmsg+0x11d/0x1b0 net/socket.c:2384
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6706:
 save_stack+0x23/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 kasan_set_free_info mm/kasan/common.c:334 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:473
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:482
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 free_states kernel/bpf/verifier.c:9475 [inline]
 bpf_check+0x1d8e/0xab11 kernel/bpf/verifier.c:9783
 bpf_prog_load+0x10b8/0x18a0 kernel/bpf/syscall.c:1805
 __do_sys_bpf+0xa48/0x37b0 kernel/bpf/syscall.c:3030
 __se_sys_bpf kernel/bpf/syscall.c:2989 [inline]
 __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2989
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88808f7b7000
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 56 bytes to the right of
 192-byte region [ffff88808f7b7000, ffff88808f7b70c0)
The buggy address belongs to the page:
page:ffffea00023dedc0 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0xffff88808f7b7a00
raw: 00fffe0000000200 ffffea000268bd88 ffffea00028b8008 ffff8880aa400000
raw: ffff88808f7b7a00 ffff88808f7b7000 000000010000000a 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808f7b6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808f7b7000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808f7b7080: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff88808f7b7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808f7b7180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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