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BUG: KASAN: use-after-free in ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1787 [inline]
BUG: KASAN: use-after-free in ocfs2_dir_foreach_blk+0x1149/0x18a0 fs/ocfs2/dir.c:1925
Read of size 2 at addr ffff88804bca08c9 by task syz.1.353/9230

CPU: 0 UID: 0 PID: 9230 Comm: syz.1.353 Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xb4/0x290 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 ocfs2_dir_foreach_blk_id fs/ocfs2/dir.c:1787 [inline]
 ocfs2_dir_foreach_blk+0x1149/0x18a0 fs/ocfs2/dir.c:1925
 ocfs2_readdir+0x254/0x4c0 fs/ocfs2/dir.c:1969
 wrap_directory_iterator+0x93/0xe0 fs/readdir.c:65
 iterate_dir+0x5ac/0x770 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:322 [inline]
 __se_sys_getdents+0xe4/0x250 fs/readdir.c:308
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea5158e969
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:00007fea52430038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007fea517b6080 RCX: 00007fea5158e969
RDX: 0000000000000054 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fea51610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fea517b6080 R15: 00007fff8c83cfd8
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x2d8 pfn:0x4bca0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea0001293808 ffffea000113a008 0000000000000000
raw: 00000000000002d8 0000000000000005 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 8960, tgid 8958 (syz.4.329), ts 307383224448, free_ts 308360701905
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x21c7/0x22a0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
 folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2320
 shmem_alloc_folio mm/shmem.c:1854 [inline]
 shmem_alloc_and_add_folio+0x447/0xf60 mm/shmem.c:1893
 shmem_get_folio_gfp+0x597/0x15f0 mm/shmem.c:2533
 shmem_get_folio mm/shmem.c:2639 [inline]
 shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3289
 generic_perform_write+0x2c4/0x910 mm/filemap.c:4103
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3464
 iter_file_splice_write+0x937/0x1000 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0xfe/0x160 fs/splice.c:1158
 splice_direct_to_actor+0x5a5/0xcc0 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1227
 vfs_copy_file_range+0xabc/0x1310 fs/read_write.c:1625
 __do_sys_copy_file_range fs/read_write.c:1675 [inline]
 __se_sys_copy_file_range+0x319/0x460 fs/read_write.c:1642
page last free pid 7854 tgid 7854 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1262 [inline]
 free_unref_folios+0xb70/0x1490 mm/page_alloc.c:2782
 folios_put_refs+0x559/0x640 mm/swap.c:992
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1125
 shmem_truncate_range mm/shmem.c:1237 [inline]
 shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365
 evict+0x501/0x9c0 fs/inode.c:810
 do_unlinkat+0x3a1/0x560 fs/namei.c:4650
 __do_sys_unlink fs/namei.c:4689 [inline]
 __se_sys_unlink fs/namei.c:4687 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4687
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804bca0780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804bca0800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804bca0880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff88804bca0900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804bca0980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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