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BUG: KASAN: use-after-free in string_nocheck lib/vsprintf.c:641 [inline]
BUG: KASAN: use-after-free in string+0x20f/0x2a0 lib/vsprintf.c:723
Read of size 1 at addr ffff888100dbceb0 by task syz.8.505/1711

CPU: 0 PID: 1711 Comm: syz.8.505 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 string_nocheck lib/vsprintf.c:641 [inline]
 string+0x20f/0x2a0 lib/vsprintf.c:723
 vsnprintf+0xec5/0x1990 lib/vsprintf.c:2689
 seq_vprintf fs/seq_file.c:398 [inline]
 seq_printf+0x185/0x280 fs/seq_file.c:413
 show_interrupts+0x921/0xa90 kernel/irq/proc.c:526
 seq_read_iter+0x908/0xce0 fs/seq_file.c:272
 proc_reg_read_iter+0x1be/0x290 fs/proc/inode.c:310
 call_read_iter include/linux/fs.h:2066 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x62a/0xa50 fs/read_write.c:496
 ksys_read+0x14a/0x260 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:642
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f48465c0159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4845019028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f4846847fa0 RCX: 00007f48465c0159
RDX: 0000000000002020 RSI: 00002000000043c0 RDI: 0000000000000005
RBP: 00007f484665706b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4846848038 R14: 00007f4846847fa0 R15: 00007ffdaa4b8b28

Allocated by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888100dbceb0
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes inside of
 8-byte region [ffff888100dbceb0, ffff888100dbceb8)
The buggy address belongs to the page:
page:ffffea0004036f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888100dbceb0 pfn:0x100dbc
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea0004196108 ffffea00042ee9c8 ffff888100043c80
raw: ffff888100dbceb0 0000000000660060 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 2043222696, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 __kmalloc+0x1f9/0x330 mm/slub.c:4034
 kmalloc include/linux/slab.h:560 [inline]
 acpi_os_allocate include/acpi/platform/aclinuxex.h:52 [inline]
 acpi_ex_allocate_name_string drivers/acpi/acpica/exnames.c:66 [inline]
 acpi_ex_get_name_string+0x5a9/0xca0 drivers/acpi/acpica/exnames.c:367
 acpi_ds_create_operand+0x168/0x8b0 drivers/acpi/acpica/dsutils.c:446
 acpi_ds_evaluate_name_path+0x15a/0x420 drivers/acpi/acpica/dsutils.c:778
 acpi_ds_exec_end_op+0x255/0x1190 drivers/acpi/acpica/dswexec.c:374
 acpi_ps_parse_loop+0xbff/0x19f0 drivers/acpi/acpica/psloop.c:526
 acpi_ps_parse_aml+0x214/0x9a0 drivers/acpi/acpica/psparse.c:475
 acpi_ps_execute_method+0x681/0x7b0 drivers/acpi/acpica/psxface.c:190
 acpi_ns_evaluate+0x650/0xa20 drivers/acpi/acpica/nseval.c:205
 acpi_ut_evaluate_object+0x12f/0x480 drivers/acpi/acpica/uteval.c:60
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888100dbcd80: fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc
 ffff888100dbce00: fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc
>ffff888100dbce80: fc 00 fc fc fc fc fb fc fc fc fc 00 fc fc fc fc
                                     ^
 ffff888100dbcf00: 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00
 ffff888100dbcf80: fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc fc fc
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