REISERFS (device loop1): journal params: device ram0, size 512, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
REISERFS (device loop1): checking transaction log (ram0)
REISERFS (device loop1): Using tea 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+0x579/0x1380 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff888051e9efa4 by task syz-executor.1/5595

CPU: 0 PID: 5595 Comm: syz-executor.1 Not tainted 6.5.0-syzkaller-01207-g1c59d383390f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x175/0x1b0 mm/kasan/report.c:588
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x579/0x1380 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0x2ce/0x19b0 fs/reiserfs/namei.c:322
 reiserfs_lookup+0x1e2/0x580 fs/reiserfs/namei.c:368
 __lookup_slow+0x282/0x3e0 fs/namei.c:1693
 lookup_one_len+0x18b/0x2d0 fs/namei.c:2745
 reiserfs_lookup_privroot+0x89/0x180 fs/reiserfs/xattr.c:977
 reiserfs_fill_super+0x195b/0x2620 fs/reiserfs/super.c:2192
 mount_bdev+0x237/0x300 fs/super.c:1590
 legacy_get_tree+0xef/0x190 fs/fs_context.c:638
 vfs_get_tree+0x8c/0x280 fs/super.c:1711
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f264307e1ea
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:00007f2643ec4ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2643ec4f80 RCX: 00007f264307e1ea
RDX: 0000000020001100 RSI: 0000000020000140 RDI: 00007f2643ec4f40
RBP: 0000000020001100 R08: 00007f2643ec4f80 R09: 0000000000000c43
R10: 0000000000000c43 R11: 0000000000000202 R12: 0000000020000140
R13: 00007f2643ec4f40 R14: 000000000000111c R15: 00000000200000c0
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000147a780 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x51e9e
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea000147a748 ffffea00014d4dc8 0000000000000000
raw: 0000000000000001 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 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5013, tgid 5010 (syz-fuzzer), ts 154989117532, free_ts 179341149079
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477
 __folio_alloc+0x13/0x30 mm/page_alloc.c:4509
 vma_alloc_folio+0x48a/0x9a0 mm/mempolicy.c:2259
 do_anonymous_page mm/memory.c:4104 [inline]
 do_pte_missing mm/memory.c:3662 [inline]
 handle_pte_fault mm/memory.c:4939 [inline]
 __handle_mm_fault mm/memory.c:5079 [inline]
 handle_mm_fault+0x20c7/0x5410 mm/memory.c:5233
 do_user_addr_fault arch/x86/mm/fault.c:1343 [inline]
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x3cf/0x7c0 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348
 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2489
 release_pages+0x2193/0x2470 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu+0x100/0x210 mm/mmu_gather.c:299
 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:391
 zap_page_range_single+0x453/0x510 mm/memory.c:1763
 madvise_dontneed_single_vma mm/madvise.c:822 [inline]
 madvise_dontneed_free mm/madvise.c:903 [inline]
 madvise_vma_behavior mm/madvise.c:1042 [inline]
 madvise_walk_vmas mm/madvise.c:1267 [inline]
 do_madvise+0x23f2/0x47d0 mm/madvise.c:1447
 __do_sys_madvise mm/madvise.c:1460 [inline]
 __se_sys_madvise mm/madvise.c:1458 [inline]
 __x64_sys_madvise+0xa5/0xb0 mm/madvise.c:1458
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888051e9ee80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888051e9ef00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888051e9ef80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888051e9f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888051e9f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================