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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88801fc4cc2a by task syz-executor/5829

CPU: 0 UID: 0 PID: 5829 Comm: syz-executor Not tainted 6.16.0-rc6-syzkaller-00135-gcf074eca0065-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x230
 kasan_report+0x118/0x150
 rose_timer_expiry+0x471/0x4b0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 cb 9e 57 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 13 cd 20 f6 65 8b 05 bc b9 2f 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900031bf9e0 EFLAGS: 00000206
RAX: 3659ea2bd910d100 RBX: 0000000000000a06 RCX: 3659ea2bd910d100
RDX: 0000000000000000 RSI: ffffffff8d996116 RDI: 0000000000000001
RBP: ffffc900031bfa70 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade
R10: dffffc0000000000 R11: fffffbfff1f43adf R12: dffffc0000000000
R13: ffff88811099e8d0 R14: ffff88811099e890 R15: 1ffff92000637f3c
 __wake_up_common_lock+0x190/0x1f0
 anon_pipe_write+0xfc6/0x1360
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb9f38d45f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007ffd3c4d8fa0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000184b RCX: 00007feb9f38d45f
RDX: 0000000000000004 RSI: 00007ffd3c4d9060 RDI: 00000000000000f8
RBP: 00007ffd3c4d900c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000b44
R13: 00000000000927c0 R14: 000000000007046f R15: 00007ffd3c4d9060
 </TASK>

Allocated by task 24634:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 inetdev_init+0x7d/0x500
 inetdev_event+0x301/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 tun_set_iff+0x844/0xef0
 __tun_chr_ioctl+0x788/0x1df0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5823:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 rcu_core+0xca8/0x1710
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0x157/0x9c0
 inetdev_event+0x81c/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 unregister_netdevice_many_notify+0x15d8/0x2320
 unregister_netdevice_queue+0x33c/0x380
 __tun_detach+0xda4/0x1560
 tun_chr_close+0x10a/0x1c0
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88801fc4cc00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88801fc4cc00, ffff88801fc4ce00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88801fc4d800 pfn:0x1fc4c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a441c80 ffffea0000df9610 ffffea0000e0dc10
raw: ffff88801fc4d800 0000000000100008 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000df9610 ffffea0000e0dc10
head: ffff88801fc4d800 0000000000100008 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00007f1301 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 5829, tgid 5829 (syz-executor), ts 58562169556, free_ts 58382013482
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_noprof+0x305/0x4f0
 fib6_info_alloc+0x30/0xf0
 ip6_route_info_create+0x142/0x860
 ip6_route_add+0x49/0x1b0
 addrconf_add_dev+0x24f/0x340
 inet6_addr_add+0x1a1/0xc00
 inet6_rtm_newaddr+0x93d/0xd20
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75c/0x8e0
page last free pid 5823 tgid 5823 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __slab_free+0x326/0x400
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 rtmsg_fib+0xea/0x4c0
 fib_table_insert+0xd64/0x1b50
 fib_magic+0x2c4/0x390
 fib_add_ifaddr+0x144/0x5f0
 fib_inetaddr_event+0x12e/0x190
 notifier_call_chain+0x1b6/0x3e0
 blocking_notifier_call_chain+0x6a/0x90
 __inet_insert_ifa+0xa13/0xbf0
 inet_rtm_newaddr+0xf3a/0x18b0

Memory state around the buggy address:
 ffff88801fc4cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801fc4cb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801fc4cc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88801fc4cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801fc4cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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