REISERFS warning (device loop1): vs-13060 reiserfs_update_sd_size: stat data of object [7 8 0x0 SD] (nlink == 2) not found (pos 1)
==================================================================
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+0x45c/0xe88 fs/reiserfs/namei.c:165
Read of size 4 at addr ffff0000e0930fc4 by task syz.1.2/4101

CPU: 0 PID: 4101 Comm: syz.1.2 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load_n_noabort+0x40/0x4c mm/kasan/report_generic.c:319
 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline]
 search_by_entry_key+0x45c/0xe88 fs/reiserfs/namei.c:165
 reiserfs_find_entry+0x2a8/0x1624 fs/reiserfs/namei.c:322
 reiserfs_add_entry+0x604/0xc8c fs/reiserfs/namei.c:511
 reiserfs_mkdir+0x588/0x77c fs/reiserfs/namei.c:862
 xattr_mkdir fs/reiserfs/xattr.c:76 [inline]
 open_xa_dir+0x484/0x578 fs/reiserfs/xattr.c:167
 xattr_lookup+0x3c/0x268 fs/reiserfs/xattr.c:395
 reiserfs_xattr_set_handle+0xe4/0xc10 fs/reiserfs/xattr.c:540
 reiserfs_xattr_set+0x398/0x4b0 fs/reiserfs/xattr.c:640
 security_set+0x9c/0xd8 fs/reiserfs/xattr_security.c:32
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x1a8/0x344 fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x250/0x2b4 fs/xattr.c:611
 path_setxattr+0x17c/0x258 fs/xattr.c:630
 __do_sys_setxattr fs/xattr.c:646 [inline]
 __se_sys_setxattr fs/xattr.c:642 [inline]
 __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:642
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:000000007e98f9c2 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x120930
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003824c48 fffffc0003824bc8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000e0930e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e0930f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000e0930f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff0000e0931000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000e0931080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
REISERFS warning (device loop1): vs-13060 reiserfs_update_sd_size: stat data of object [3 7 0x0 SD] (nlink == 3) not found (pos 1)
REISERFS warning (device loop1): vs-13060 reiserfs_update_sd_size: stat data of object [7 8 0x0 SD] (nlink == 2) not found (pos 1)