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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff8881079c442a by task syz-executor/5849

CPU: 1 UID: 0 PID: 5849 Comm: syz-executor Not tainted syzkaller #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:page_ext_lookup+0xf2/0x180
Code: 10 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 e1 e4 f4 ff 49 8b 1e e8 79 ff 76 ff 89 c5 31 ff 89 c6 e8 be 7f 91 ff <85> ed 74 59 e8 75 7b 91 ff 48 85 db 40 0f 95 c5 48 89 de 48 83 e6
RSP: 0018:ffffc9000454f310 EFLAGS: 00000293
RAX: ffffffff822e2fb2 RBX: ffff8880fc000000 RCX: 0000000000000000
RDX: ffff888106e29cc0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff94000835f29 R12: 0000000000106be5
R13: dffffc0000000000 R14: ffff88805fffa810 R15: 0000000000001000
 page_table_check_set+0x27e/0x730
 copy_pmd_range+0x4439/0x71d0
 copy_page_range+0xc14/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0bffd85453
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffe027044e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0bffd85453
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055557d4aa7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000003d207 R15: 00007ffe02704680
 </TASK>

Allocated by task 21302:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 device_add+0xbe/0xb50
 nfc_register_device+0x4f/0x320
 nci_register_device+0x87f/0x9d0
 virtual_ncidev_open+0x129/0x1a0
 misc_open+0x2bc/0x330
 chrdev_open+0x4cc/0x5e0
 do_dentry_open+0x953/0x13f0
 vfs_open+0x3b/0x340
 path_openat+0x2ee5/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 21301:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 kobject_put+0x22b/0x480
 nci_free_device+0x3d/0xa0
 virtual_ncidev_close+0x6d/0x90
 __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 ffff8881079c4400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff8881079c4400, ffff8881079c4600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881079c4400 pfn:0x1079c4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a441c80 0000000000000000 dead000000000001
raw: ffff8881079c4400 000000000010000f 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a441c80 0000000000000000 dead000000000001
head: ffff8881079c4400 000000000010000f 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00041e7101 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 1, tgid 1 (swapper/0), ts 19277156966, free_ts 18979433023
 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_cache_noprof+0x296/0x3d0
 ip_vs_stats_alloc+0x50/0x180
 ip_vs_est_add_kthread+0x3de/0x700
 ip_vs_start_estimator+0x1ed/0x360
 ip_vs_control_net_init+0x138d/0x1900
 __ip_vs_init+0x2d2/0x460
 ops_init+0x35c/0x5c0
 register_pernet_operations+0x336/0x800
 register_pernet_subsys+0x28/0x40
 ip_vs_init+0x28/0xc0
page last free pid 1 tgid 1 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __slab_free+0x303/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x1be/0x3d0
 snd_timer_new+0xd8/0x6d0
 snd_pcm_timer_init+0x162/0x3e0
 snd_pcm_dev_register+0x6be/0x920
 snd_device_register_all+0xd3/0x1b0
 snd_card_register+0x1cf/0x760
 snd_dummy_probe+0x108f/0x1870
 platform_probe+0xf9/0x190
 really_probe+0x26d/0x9e0
 __driver_probe_device+0x18c/0x2f0
 driver_probe_device+0x4f/0x430

Memory state around the buggy address:
 ffff8881079c4300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881079c4380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881079c4400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8881079c4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881079c4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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