syzbot

REISERFS warning:  read_super_block: reiserfs filesystem is deprecated and scheduled to be removed from the kernel in 2025
REISERFS (device loop0): found reiserfs format "3.5" with non-standard journal
REISERFS (device loop0): using ordered data mode
reiserfs: using flush barriers
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 ffff888070ae1004 by task syz-executor322/3539

CPU: 0 PID: 3539 Comm: syz-executor322 Not tainted 6.1.32-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 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+0xf47/0x19b0 fs/reiserfs/namei.c:322
 reiserfs_lookup+0x1e6/0x4b0 fs/reiserfs/namei.c:368
 __lookup_slow+0x27e/0x3d0 fs/namei.c:1685
 lookup_one_len+0x187/0x2d0 fs/namei.c:2711
 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:973
 reiserfs_fill_super+0x1957/0x2620 fs/reiserfs/super.c:2192
 mount_bdev+0x2c9/0x3f0 fs/super.c:1423
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1553
 do_new_mount+0x28b/0xae0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f93cfc2426a
Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 98 03 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc54c72128 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f93cfc2426a
RDX: 0000000020000140 RSI: 0000000020000340 RDI: 00007ffc54c72130
RBP: 00007ffc54c72130 R08: 00007ffc54c72170 R09: 0000000000000000
R10: 000000000120c083 R11: 0000000000000286 R12: 0000000000000004
R13: 000055555747d2c0 R14: 00007ffc54c72170 R15: 0000000000000000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c2b840 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x70ae1
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001c2b888 ffff8880b98405a0 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 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 10137442883, free_ts 11435758549
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533
 split_map_pages+0x246/0x510 mm/compaction.c:97
 isolate_freepages_range+0x47c/0x4e0 mm/compaction.c:735
 alloc_contig_range+0x62a/0x990 mm/page_alloc.c:9394
 __alloc_contig_pages mm/page_alloc.c:9417 [inline]
 alloc_contig_pages+0x3f0/0x4e0 mm/page_alloc.c:9497
 debug_vm_pgtable_alloc_huge_page+0xb9/0x108 mm/debug_vm_pgtable.c:1098
 init_args+0xa7d/0xda4 mm/debug_vm_pgtable.c:1221
 debug_vm_pgtable+0xaa/0x46b mm/debug_vm_pgtable.c:1259
 do_one_initcall+0x265/0x8f0 init/main.c:1303
 do_initcall_level+0x157/0x207 init/main.c:1376
 do_initcalls+0x49/0x86 init/main.c:1392
 kernel_init_freeable+0x473/0x61f init/main.c:1631
 kernel_init+0x19/0x290 init/main.c:1519
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1460 [inline]
 free_pcp_prepare mm/page_alloc.c:1510 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388
 free_unref_page+0x98/0x570 mm/page_alloc.c:3484
 free_contig_range+0x9a/0x150 mm/page_alloc.c:9519
 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031
 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354
 do_one_initcall+0x265/0x8f0 init/main.c:1303
 do_initcall_level+0x157/0x207 init/main.c:1376
 do_initcalls+0x49/0x86 init/main.c:1392
 kernel_init_freeable+0x473/0x61f init/main.c:1631
 kernel_init+0x19/0x290 init/main.c:1519
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff888070ae0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888070ae0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888070ae1000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888070ae1080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888070ae1100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================