REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
==================================================================
BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
BUG: KASAN: use-after-free in search_by_entry_key+0x575/0x1380 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff888072a58004 by task syz-executor.0/5421

CPU: 0 PID: 5421 Comm: syz-executor.0 Not tainted 6.10.0-rc6-syzkaller-00051-g1dfe225e9af5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x23d/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x165/0x540 mm/kasan/report.c:488
 kasan_report+0x13f/0x180 mm/kasan/report.c:601
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x575/0x1380 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0xf4d/0x19c0 fs/reiserfs/namei.c:322
 reiserfs_lookup+0x1de/0x580 fs/reiserfs/namei.c:368
 __lookup_slow+0x288/0x3f0 fs/namei.c:1692
 lookup_one_len+0x187/0x2d0 fs/namei.c:2764
 reiserfs_lookup_privroot+0x85/0x180 fs/reiserfs/xattr.c:977
 reiserfs_fill_super+0x195b/0x2620 fs/reiserfs/super.c:2191
 mount_bdev+0x206/0x2d0 fs/super.c:1668
 legacy_get_tree+0xea/0x190 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1789
 do_new_mount+0x2ba/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x7e/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f891f47e05a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f892027dee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f892027df80 RCX: 00007f891f47e05a
RDX: 0000000020000140 RSI: 0000000020000340 RDI: 00007f892027df40
RBP: 0000000020000140 R08: 00007f892027df80 R09: 000000000120c083
R10: 000000000120c083 R11: 0000000000000246 R12: 0000000020000340
R13: 00007f892027df40 R14: 0000000000001120 R15: 0000000020000380
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x2c pfn:0x72a58
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001ca9d88 ffffea0001ca9a88 0000000000000000
raw: 000000000000002c 0000000000000000 00000000ffffffff 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 5425, tgid 5425 (sed), ts 100819874052, free_ts 100849977577
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1df/0x220 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x2de6/0x2ea0 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x252/0x6a0 mm/page_alloc.c:4683
 alloc_pages_mpol_noprof+0x3e4/0x670 mm/mempolicy.c:2265
 vma_alloc_folio_noprof+0xef/0x1f0 mm/mempolicy.c:2304
 folio_prealloc+0x31/0x170
 do_cow_fault mm/memory.c:4945 [inline]
 do_fault mm/memory.c:5053 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault+0xd79/0x6f10 mm/memory.c:5381
 __handle_mm_fault mm/memory.c:5524 [inline]
 handle_mm_fault+0x10db/0x1b70 mm/memory.c:5689
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x3e8/0x7e0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:623
page last free pid 5425 tgid 5425 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 free_unref_folios+0xef5/0x1980 mm/page_alloc.c:2637
 folios_put_refs+0x92e/0xa50 mm/swap.c:1024
 free_pages_and_swap_cache+0x2e6/0x690 mm/swap_state.c:329
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
 tlb_flush_mmu+0x39f/0x670 mm/mmu_gather.c:373
 tlb_finish_mmu+0xd0/0x1f0 mm/mmu_gather.c:465
 exit_mmap+0x44b/0xc40 mm/mmap.c:3354
 __mmput+0x115/0x3c0 kernel/fork.c:1346
 exit_mm+0x21c/0x300 kernel/exit.c:565
 do_exit+0x9a6/0x27d0 kernel/exit.c:861
 do_group_exit+0x203/0x2b0 kernel/exit.c:1023
 __do_sys_exit_group kernel/exit.c:1034 [inline]
 __se_sys_exit_group kernel/exit.c:1032 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x7e/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Memory state around the buggy address:
 ffff888072a57f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888072a57f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888072a58000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888072a58080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888072a58100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================