================================================================== BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x680/0x1270 fs/hfsplus/unicode.c:179 Read of size 2 at addr ffff888021a9840c by task syz.6.662/15635 CPU: 1 UID: 0 PID: 15635 Comm: syz.6.662 Not tainted 6.16.0-rc3-syzkaller-00072-gee88bddf7f2f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 hfsplus_uni2asc+0x680/0x1270 fs/hfsplus/unicode.c:179 hfsplus_readdir+0x709/0xd60 fs/hfsplus/dir.c:207 iterate_dir+0x5af/0x770 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0xe4/0x250 fs/readdir.c:312 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff9b878e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff9b951a038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00007ff9b89b5fa0 RCX: 00007ff9b878e929 RDX: 0000000020002078 RSI: 0000200000001fc0 RDI: 0000000000000005 RBP: 00007ff9b8810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff9b89b5fa0 R15: 00007fff08fec1a8 Allocated by task 15635: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] hfsplus_find_init+0x8c/0x1d0 fs/hfsplus/bfind.c:21 hfsplus_readdir+0x1d4/0xd60 fs/hfsplus/dir.c:144 iterate_dir+0x5af/0x770 fs/readdir.c:108 __do_sys_getdents fs/readdir.c:326 [inline] __se_sys_getdents+0xe4/0x250 fs/readdir.c:312 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888021a98000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes to the right of allocated 1036-byte region [ffff888021a98000, ffff888021a9840c) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21a98 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a442000 ffffea000149fe00 dead000000000002 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a442000 ffffea000149fe00 dead000000000002 head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea000086a601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3165177293, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] acpi_ds_create_walk_state+0xd9/0x270 drivers/acpi/acpica/dswstate.c:518 acpi_ds_auto_serialize_method+0xe3/0x240 drivers/acpi/acpica/dsmethod.c:81 acpi_ds_init_one_object+0x172/0x380 drivers/acpi/acpica/dsinit.c:110 acpi_ns_walk_namespace+0x268/0x690 drivers/acpi/acpica/nswalk.c:-1 acpi_ds_initialize_objects+0x12c/0x1d0 drivers/acpi/acpica/dsinit.c:189 acpi_ns_load_table+0x101/0x130 drivers/acpi/acpica/nsload.c:106 acpi_tb_load_namespace+0x27c/0x6c0 drivers/acpi/acpica/tbxfload.c:158 acpi_load_tables+0x47/0x100 drivers/acpi/acpica/tbxfload.c:59 acpi_bus_init+0x92/0x6c0 drivers/acpi/bus.c:1343 page_owner free stack trace missing Memory state around the buggy address: ffff888021a98300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888021a98380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888021a98400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888021a98480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888021a98500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================