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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff8880304f242a by task syz.1.8051/23858

CPU: 0 UID: 0 PID: 23858 Comm: syz.1.8051 Not tainted 6.16.0-syzkaller-12063-g37816488247d-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/0x240
 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:pfn_valid+0x71/0x490
Code: b1 99 e8 b2 bb f4 ff 48 8b 05 5b c5 82 17 48 85 c0 74 40 4c 89 f1 48 c1 e9 16 48 8d 1c c8 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 85 bb f4 ff 4c 8b 3b 4d 85 ff 74 1e 4c 89 f3 48
RSP: 0018:ffffc90006d37558 EFLAGS: 00000246
RAX: 1ffff11027ffde80 RBX: ffff88813ffef400 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000002ec15 RDI: 0000000400000000
RBP: ffffc90006d37890 R08: ffffea0000bb0547 R09: 1ffffd40001760a8
R10: dffffc0000000000 R11: fffff940001760a9 R12: dffffc0000000000
R13: 1ffffd40001760ab R14: 000000000002ec15 R15: 0000000000000000
 page_table_check_clear+0x21/0x700
 unmap_page_range+0x3445/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f926498ebe9
Code: Unable to access opcode bytes at 0x7f926498ebbf.
RSP: 002b:00007fff50c26a08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f926498ebe9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff50c26a6c R08: 0000000250c26aff R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000af5
R13: 00000000000927c0 R14: 0000000000049840 R15: 00007fff50c26ac0
 </TASK>

Allocated by task 23243:
 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 15:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 rcu_core+0xcab/0x1770
 handle_softirqs+0x286/0x870
 run_ksoftirqd+0x9b/0x100
 smpboot_thread_fn+0x542/0xa60
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

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+0x14d7/0x1ff0
 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 ffff8880304f2400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff8880304f2400, ffff8880304f2600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880304f0400 pfn:0x304f0
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 ffffea0000ab7210 ffffea0000a6d210
raw: ffff8880304f0400 0000000000100008 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000ab7210 ffffea0000a6d210
head: ffff8880304f0400 0000000000100008 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000c13c01 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 28, tgid 28 (kworker/u9:1), ts 56615336313, free_ts 0
 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/0x370
 ___slab_alloc+0xbeb/0x1410
 __kmalloc_noprof+0x305/0x4f0
 fib6_info_alloc+0x30/0xf0
 ip6_route_info_create+0x142/0x860
 ip6_route_add+0x49/0x1b0
 addrconf_add_linklocal+0x45f/0x6c0
 addrconf_addr_gen+0x490/0x580
 addrconf_init_auto_addrs+0x62d/0xa30
 addrconf_notify+0xacc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 netif_state_change+0x284/0x3a0
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880304f2300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880304f2380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880304f2400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8880304f2480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880304f2500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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