================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0 Read of size 144 at addr ffff88804cf17fc0 by task syz-executor.1/32622 CPU: 1 PID: 32622 Comm: syz-executor.1 Not tainted 6.7.0-rc4-syzkaller-00358-gf2e8a57ee903 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __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+0x142/0x170 mm/kasan/report.c:588 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 leaf_paste_in_buffer+0x635/0xab0 leaf_copy_dir_entries+0x71e/0xc60 fs/reiserfs/lbalance.c:108 leaf_copy_boundary_item+0xbbe/0x21b0 fs/reiserfs/lbalance.c:168 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0xd1a/0x2960 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xbe/0x430 fs/reiserfs/lbalance.c:750 balance_leaf+0x15d1/0x12510 fs/reiserfs/do_balan.c:1409 do_balance+0x30d/0x8f0 fs/reiserfs/do_balan.c:1888 reiserfs_insert_item+0xace/0xc30 fs/reiserfs/stree.c:2260 reiserfs_new_inode+0x1177/0x1cb0 fs/reiserfs/inode.c:2048 reiserfs_create+0x3e7/0x6e0 fs/reiserfs/namei.c:666 lookup_open fs/namei.c:3477 [inline] open_last_lookups fs/namei.c:3546 [inline] path_openat+0x13fa/0x3290 fs/namei.c:3776 do_filp_open+0x234/0x490 fs/namei.c:3809 do_sys_openat2+0x13e/0x1d0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fa40467cba9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa40535a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa40479bf80 RCX: 00007fa40467cba9 RDX: 0000000000080840 RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007fa4046c847a R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001f4 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa40479bf80 R15: 00007ffe5a0f3028 The buggy address belongs to the physical page: page:ffffea000133c5c0 refcount:2 mapcount:0 mapping:ffff88801b09cd78 index:0x213 pfn:0x4cf17 memcg:ffff888065a68000 aops:def_blk_aops ino:700001 flags: 0xfff00000008124(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000008124 ffffea000229a4c8 ffffea000233dd08 ffff88801b09cd78 raw: 0000000000000213 ffff88807657f488 00000002ffffffff ffff888065a68000 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 32622, tgid 32621 (syz-executor.1), ts 1145360994048, free_ts 1145354705335 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_pages mm/mempolicy.c:2204 [inline] folio_alloc+0x12a/0x330 mm/mempolicy.c:2211 filemap_alloc_folio+0xde/0x500 mm/filemap.c:974 __filemap_get_folio+0x431/0xbb0 mm/filemap.c:1918 grow_dev_page fs/buffer.c:1041 [inline] grow_buffers fs/buffer.c:1106 [inline] __getblk_slow fs/buffer.c:1133 [inline] bdev_getblk+0x243/0x6d0 fs/buffer.c:1429 __getblk include/linux/buffer_head.h:358 [inline] sb_getblk include/linux/buffer_head.h:364 [inline] search_by_key+0x4a2/0x4940 fs/reiserfs/stree.c:672 reiserfs_read_locked_inode+0x240/0x2950 fs/reiserfs/inode.c:1543 reiserfs_fill_super+0x1363/0x2620 fs/reiserfs/super.c:2071 mount_bdev+0x237/0x300 fs/super.c:1650 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x2a0 fs/super.c:1771 do_new_mount+0x28f/0xae0 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347 free_unref_page_list+0x5a0/0x840 mm/page_alloc.c:2533 release_pages+0x2117/0x2400 mm/swap.c:1042 __folio_batch_release+0x84/0x100 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x6aa/0x19d0 mm/shmem.c:1004 shmem_truncate_range mm/shmem.c:1096 [inline] shmem_evict_inode+0x29b/0xa60 mm/shmem.c:1224 evict+0x2a4/0x630 fs/inode.c:666 __dentry_kill+0x436/0x660 fs/dcache.c:607 dentry_kill+0xbb/0x290 dput+0x21e/0x470 fs/dcache.c:913 __fput+0x60b/0xa10 fs/file_table.c:402 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:89 Memory state around the buggy address: ffff88804cf17f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804cf17f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804cf18000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88804cf18080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804cf18100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 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