================================================================== BUG: KASAN: out-of-bounds in leaf_cut_from_buffer+0x1546/0x2600 fs/reiserfs/lbalance.c:1210 Read of size 18446744073709551484 at addr ffff888052076000 by task syz.6.108/5083 CPU: 0 PID: 5083 Comm: syz.6.108 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 leaf_cut_from_buffer+0x1546/0x2600 fs/reiserfs/lbalance.c:1210 leaf_move_items+0xaab/0xde0 fs/reiserfs/lbalance.c:729 leaf_shift_right+0x2a/0xe0 fs/reiserfs/lbalance.c:803 balance_leaf_paste_right_shift fs/reiserfs/do_balan.c:789 [inline] balance_leaf_paste_right fs/reiserfs/do_balan.c:897 [inline] balance_leaf_right fs/reiserfs/do_balan.c:916 [inline] balance_leaf+0xb4cb/0x10e60 fs/reiserfs/do_balan.c:1415 do_balance+0x2fa/0x930 fs/reiserfs/do_balan.c:1888 reiserfs_paste_into_item+0x69b/0x7e0 fs/reiserfs/stree.c:2159 reiserfs_get_block+0x1bdc/0x3ef0 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x54b/0x1a70 fs/buffer.c:1991 reiserfs_write_begin+0x206/0x4c0 fs/reiserfs/inode.c:2775 generic_perform_write+0x2db/0x560 mm/filemap.c:3846 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f136ab8ebe9 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:00007f136ba74038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f136adc6090 RCX: 00007f136ab8ebe9 RDX: 0000000000010448 RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007f136ac11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f136adc6128 R14: 00007f136adc6090 R15: 00007ffcfc4c0538 The buggy address belongs to the physical page: page:ffffea0001481d80 refcount:2 mapcount:0 mapping:ffff888140c912f8 index:0x215 pfn:0x52076 memcg:ffff888078c36000 aops:def_blk_aops ino:700006 flags: 0xfff58000002052(referenced|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff58000002052 ffffea0001481d48 ffffea0001481dc8 ffff888140c912f8 raw: 0000000000000215 ffff88805535b0e8 00000002ffffffff ffff888078c36000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5083, tgid 5074 (syz.6.108), ts 135006892859, free_ts 131207513344 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292 filemap_alloc_folio+0xdb/0x460 mm/filemap.c:999 __filemap_get_folio+0x697/0xdd0 mm/filemap.c:1993 pagecache_get_page+0x26/0x250 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:646 [inline] grow_dev_page fs/buffer.c:946 [inline] grow_buffers fs/buffer.c:1011 [inline] __getblk_slow fs/buffer.c:1038 [inline] __getblk_gfp+0x2d8/0xb20 fs/buffer.c:1333 sb_getblk include/linux/buffer_head.h:356 [inline] get_empty_nodes+0x511/0x8c0 fs/reiserfs/fix_node.c:890 ip_check_balance fs/reiserfs/fix_node.c:1381 [inline] check_balance fs/reiserfs/fix_node.c:2083 [inline] fix_nodes+0x116b/0x82d0 fs/reiserfs/fix_node.c:2635 reiserfs_paste_into_item+0x5c8/0x7e0 fs/reiserfs/stree.c:2130 reiserfs_get_block+0x1bdc/0x3ef0 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x54b/0x1a70 fs/buffer.c:1991 reiserfs_write_begin+0x206/0x4c0 fs/reiserfs/inode.c:2775 generic_cont_expand_simple+0x136/0x1f0 fs/buffer.c:2347 reiserfs_setattr+0x639/0x1240 fs/reiserfs/inode.c:3305 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3525 release_pages+0x1f92/0x2200 mm/swap.c:1035 __pagevec_release+0x6d/0xe0 mm/swap.c:1055 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x75b/0x2050 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x248/0xa40 mm/shmem.c:1171 evict+0x485/0x870 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x5e0/0x920 fs/file_table.c:328 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x93e/0x2400 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871 Memory state around the buggy address: ffff888052075f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888052075f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888052076000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888052076080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888052076100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================