REISERFS (device loop3): Using tea hash to sort names REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage. REISERFS warning (device loop3): vs-13060 reiserfs_update_sd_size: stat data of object [2 6 0x0 SD] (nlink == 1) not found (pos 1) ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x1c8/0xab0 fs/reiserfs/lbalance.c:1017 Write of size 3936 at addr ffff8880711e0140 by task syz.3.95/4975 CPU: 1 PID: 4975 Comm: syz.3.95 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memmove+0x3c/0x60 mm/kasan/shadow.c:55 leaf_paste_in_buffer+0x1c8/0xab0 fs/reiserfs/lbalance.c:1017 leaf_copy_boundary_item+0xc75/0x2190 fs/reiserfs/lbalance.c:199 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0x84a/0xde0 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xb9/0x450 fs/reiserfs/lbalance.c:750 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:458 [inline] balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline] balance_leaf_left fs/reiserfs/do_balan.c:613 [inline] balance_leaf+0x2c05/0x10e60 fs/reiserfs/do_balan.c:1409 do_balance+0x2fa/0x930 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x69b/0x7e0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1bde/0x4100 fs/reiserfs/inode.c:1077 __block_write_begin_int+0x54e/0x15a0 fs/buffer.c:2012 reiserfs_write_begin+0x34b/0x810 fs/reiserfs/inode.c:2790 generic_perform_write+0x2aa/0x530 mm/filemap.c:3785 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x712/0xd00 fs/read_write.c:594 ksys_write+0x14d/0x250 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f0f94018ba9 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:00007f0f92280038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f0f9425ffa0 RCX: 00007f0f94018ba9 RDX: 0000000000010448 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007f0f9409be19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0f94260038 R14: 00007f0f9425ffa0 R15: 00007ffda38fdf18 The buggy address belongs to the page: page:ffffea0001c47800 refcount:1 mapcount:0 mapping:ffff88805f8ab510 index:0x37 pfn:0x711e0 memcg:ffff88807e0e8000 aops:shmem_aops ino:2c dentry name:"memfd:syzkaller" flags: 0xfff0000008001e(referenced|uptodate|dirty|lru|swapbacked|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff0000008001e ffffea0001a24848 ffffea00017464c8 ffff88805f8ab510 raw: 0000000000000037 0000000000000000 00000001ffffffff ffff88807e0e8000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x1100cca(GFP_HIGHUSER_MOVABLE), pid 5002, ts 112153372841, free_ts 111775182552 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_pages_vma+0x393/0x7c0 mm/mempolicy.c:2146 shmem_alloc_page mm/shmem.c:1586 [inline] shmem_alloc_and_acct_page+0x427/0xb70 mm/shmem.c:1611 shmem_getpage_gfp+0x14f4/0x2d40 mm/shmem.c:1906 shmem_getpage mm/shmem.c:151 [inline] shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474 generic_perform_write+0x2aa/0x530 mm/filemap.c:3785 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x712/0xd00 fs/read_write.c:594 ksys_write+0x14d/0x250 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x122/0x7e0 mm/page_alloc.c:3433 release_pages+0x184b/0x1bb0 mm/swap.c:963 __pagevec_release+0x6d/0xe0 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x5cb/0x1880 mm/shmem.c:964 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x20d/0xa00 mm/shmem.c:1145 evict+0x485/0x870 fs/inode.c:647 __dentry_kill+0x431/0x650 fs/dcache.c:586 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xd8/0x1a0 fs/dcache.c:893 __fput+0x5ee/0x930 fs/file_table.c:319 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x61e/0x20a0 kernel/exit.c:883 do_group_exit+0x12e/0x300 kernel/exit.c:997 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867 Memory state around the buggy address: ffff8880711e0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880711e0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880711e0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880711e0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880711e0200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================