==================================================================
BUG: KASAN: slab-out-of-bounds in nexthop_is_blackhole include/net/nexthop.h:372 [inline]
BUG: KASAN: slab-out-of-bounds in __find_rr_leaf+0xd40/0xe00 net/ipv6/route.c:855
Read of size 1 at addr ffff88802d75791e by task kworker/u32:0/12

CPU: 2 UID: 0 PID: 12 Comm: kworker/u32:0 Not tainted 6.15.0-syzkaller-12426-ge271ed52b344 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 nexthop_is_blackhole include/net/nexthop.h:372 [inline]
 __find_rr_leaf+0xd40/0xe00 net/ipv6/route.c:855
 find_rr_leaf net/ipv6/route.c:899 [inline]
 rt6_select net/ipv6/route.c:934 [inline]
 fib6_table_lookup+0x7b3/0xa30 net/ipv6/route.c:2232
 ip6_pol_route+0x1cc/0x1230 net/ipv6/route.c:2268
 pol_lookup_func include/net/ip6_fib.h:617 [inline]
 fib6_rule_lookup+0x536/0x720 net/ipv6/fib6_rules.c:120
 ip6_route_input_lookup net/ipv6/route.c:2337 [inline]
 ip6_route_input+0x662/0xc00 net/ipv6/route.c:2640
 ip6_rcv_finish_core.constprop.0+0x1a0/0x5d0 net/ipv6/ip6_input.c:66
 ip6_rcv_finish net/ipv6/ip6_input.c:77 [inline]
 NF_HOOK include/linux/netfilter.h:317 [inline]
 NF_HOOK include/linux/netfilter.h:311 [inline]
 ipv6_rcv+0x1e8/0x680 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5977
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6090
 process_backlog+0x442/0x15e0 net/core/dev.c:6442
 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7414
 napi_poll net/core/dev.c:7478 [inline]
 net_rx_action+0xa9f/0xfe0 net/core/dev.c:7605
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 do_softirq kernel/softirq.c:480 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:467
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
 __dev_queue_xmit+0x8ab/0x43e0 net/core/dev.c:4740
 dev_queue_xmit include/linux/netdevice.h:3355 [inline]
 neigh_resolve_output net/core/neighbour.c:1512 [inline]
 neigh_resolve_output+0x53a/0x940 net/core/neighbour.c:1492
 neigh_output include/net/neighbour.h:539 [inline]
 ip6_finish_output2+0xaeb/0x2020 net/ipv6/ip6_output.c:141
 __ip6_finish_output net/ipv6/ip6_output.c:215 [inline]
 ip6_finish_output+0x3f9/0x1360 net/ipv6/ip6_output.c:226
 NF_HOOK_COND include/linux/netfilter.h:306 [inline]
 ip6_output+0x1f9/0x540 net/ipv6/ip6_output.c:247
 dst_output include/net/dst.h:459 [inline]
 NF_HOOK include/linux/netfilter.h:317 [inline]
 ndisc_send_skb+0xa91/0x1e40 net/ipv6/ndisc.c:513
 ndisc_send_ns+0xc6/0x140 net/ipv6/ndisc.c:671
 addrconf_dad_work+0xbc1/0x14e0 net/ipv6/addrconf.c:4286
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 7524:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 binderfs_binder_device_create.isra.0+0x189/0xc30 drivers/android/binderfs.c:147
 binderfs_fill_super+0x8d4/0x1360 drivers/android/binderfs.c:730
 vfs_get_super fs/super.c:1323 [inline]
 get_tree_nodev+0xdd/0x190 fs/super.c:1342
 vfs_get_tree+0x8e/0x340 fs/super.c:1802
 do_new_mount fs/namespace.c:3856 [inline]
 path_mount+0x14d4/0x1f70 fs/namespace.c:4180
 do_mount fs/namespace.c:4193 [inline]
 __do_sys_mount fs/namespace.c:4404 [inline]
 __se_sys_mount fs/namespace.c:4381 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802d757800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 6 bytes to the right of
 allocated 280-byte region [ffff88802d757800, ffff88802d757918)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d754
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000b5d501 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5347, tgid 5347 (udevd), ts 77901008040, free_ts 74490867957
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2451 [inline]
 allocate_slab mm/slub.c:2619 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2673
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 __kmalloc_cache_noprof+0xfb/0x3e0 mm/slub.c:4354
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 kernfs_fop_open+0x244/0xda0 fs/kernfs/file.c:623
 do_dentry_open+0x741/0x1c10 fs/open.c:964
 vfs_open+0x82/0x3f0 fs/open.c:1094
 do_open fs/namei.c:3887 [inline]
 path_openat+0x1de4/0x2cb0 fs/namei.c:4046
 do_filp_open+0x20b/0x470 fs/namei.c:4073
 do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x174/0x210 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
page last free pid 5944 tgid 5944 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
 discard_slab mm/slub.c:2717 [inline]
 __put_partials+0x16d/0x1c0 mm/slub.c:3186
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 __kmalloc_cache_node_noprof+0x217/0x420 mm/slub.c:4367
 kmalloc_node_noprof include/linux/slab.h:928 [inline]
 __get_vm_area_node+0x101/0x330 mm/vmalloc.c:3168
 __vmalloc_node_range_noprof+0x271/0x14b0 mm/vmalloc.c:3845
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3948
 alloc_counters net/ipv4/netfilter/ip_tables.c:799 [inline]
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:821 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1022 [inline]
 do_ipt_get_ctl+0x6b6/0xaa0 net/ipv4/netfilter/ip_tables.c:1668
 nf_getsockopt+0x79/0xe0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x18c/0x1e0 net/ipv4/ip_sockglue.c:1777
 tcp_getsockopt+0x9e/0x100 net/ipv4/tcp.c:4760
 do_sock_getsockopt+0x3ff/0x800 net/socket.c:2357
 __sys_getsockopt+0x12f/0x260 net/socket.c:2386
 __do_sys_getsockopt net/socket.c:2393 [inline]
 __se_sys_getsockopt net/socket.c:2390 [inline]
 __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2390

Memory state around the buggy address:
 ffff88802d757800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802d757880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802d757900: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff88802d757980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802d757a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================