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BUG: KASAN: out-of-bounds in hlist_add_head include/linux/list.h:796 [inline]
BUG: KASAN: out-of-bounds in enqueue_timer kernel/time/timer.c:541 [inline]
BUG: KASAN: out-of-bounds in __internal_add_timer+0x2a6/0x4a0 kernel/time/timer.c:554
Write of size 8 at addr ffff8881c2bbb1c8 by task syz-executor.5/21090

CPU: 0 PID: 21090 Comm: syz-executor.5 Not tainted 5.4.219-syzkaller-00096-gd7e5d5321233 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 print_address_description+0x8c/0x630 mm/kasan/report.c:384
 __kasan_report+0xf6/0x130 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 hlist_add_head include/linux/list.h:796 [inline]
 enqueue_timer kernel/time/timer.c:541 [inline]
 __internal_add_timer+0x2a6/0x4a0 kernel/time/timer.c:554
 internal_add_timer kernel/time/timer.c:604 [inline]
 __mod_timer+0xaad/0x1c90 kernel/time/timer.c:1065
 tun_set_iff+0x8ca/0x1050 drivers/net/tun.c:2865
 __tun_chr_ioctl+0x88e/0x1ee0 drivers/net/tun.c:3160
 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

The buggy address belongs to the page:
page:ffffea00070aeec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881e7a84d00
flags: 0x8000000000000000()
raw: 8000000000000000 dead000000000100 dead000000000122 0000000000000000
raw: ffff8881e7a84d00 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x194/0x380 mm/page_alloc.c:2171
 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x372/0x860 mm/page_alloc.c:4891
 __alloc_pages include/linux/gfp.h:503 [inline]
 __alloc_pages_node include/linux/gfp.h:516 [inline]
 alloc_pages_node include/linux/gfp.h:530 [inline]
 pcpu_alloc_pages mm/percpu-vm.c:94 [inline]
 pcpu_populate_chunk+0x121/0xca0 mm/percpu-vm.c:284
 pcpu_alloc+0x7dc/0x1060 mm/percpu.c:1714
 prealloc_init kernel/bpf/hashtab.c:154 [inline]
 htab_map_alloc+0x88c/0x11f0 kernel/bpf/hashtab.c:378
 find_and_alloc_map kernel/bpf/syscall.c:122 [inline]
 map_create kernel/bpf/syscall.c:573 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2873 [inline]
 __se_sys_bpf+0x3018/0xbba0 kernel/bpf/syscall.c:2849
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1176 [inline]
 __free_pages_ok+0x7fe/0x930 mm/page_alloc.c:1438
 free_the_page mm/page_alloc.c:4953 [inline]
 __free_pages+0x8f/0x250 mm/page_alloc.c:4959
 kfree+0x1ef/0x260 mm/slub.c:4068
 device_release+0x70/0x1a0 drivers/base/core.c:1776
 kobject_cleanup lib/kobject.c:708 [inline]
 kobject_release+0x20c/0x330 lib/kobject.c:739
 tun_set_iff+0xc0b/0x1050 drivers/net/tun.c:2917
 __tun_chr_ioctl+0x88e/0x1ee0 drivers/net/tun.c:3160
 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1

Memory state around the buggy address:
 ffff8881c2bbb080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881c2bbb100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881c2bbb180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                              ^
 ffff8881c2bbb200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881c2bbb280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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