================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0 Read of size 144 at addr ffff888082780fc0 by task syz-executor.4/15833 CPU: 0 PID: 15833 Comm: syz-executor.4 Not tainted 6.7.0-rc8-syzkaller-00024-gac865f00af29 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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 add_save_link+0x479/0x7c0 fs/reiserfs/super.c:495 reiserfs_truncate_file+0x4bd/0x820 fs/reiserfs/inode.c:2301 reiserfs_setattr+0xbc9/0x1140 fs/reiserfs/inode.c:3388 notify_change+0xb99/0xe60 fs/attr.c:499 do_truncate+0x220/0x300 fs/open.c:66 handle_truncate fs/namei.c:3280 [inline] do_open fs/namei.c:3626 [inline] path_openat+0x29e1/0x3290 fs/namei.c:3779 do_filp_open+0x234/0x490 fs/namei.c:3809 do_sys_openat2+0x13e/0x1d0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1463 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: 0033:0x7fb6d987cce9 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:00007fb6da54d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fb6d999c050 RCX: 00007fb6d987cce9 RDX: 000000000000275a RSI: 00000000200000c0 RDI: ffffffffffffff9c RBP: 00007fb6d98c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb6d999c050 R15: 00007fff2c0c0b78 The buggy address belongs to the physical page: page:ffffea000209e000 refcount:2 mapcount:0 mapping:ffff888148c558f8 index:0x213 pfn:0x82780 memcg:ffff88802a550000 aops:def_blk_aops ino:700004 flags: 0xfff00000008124(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000008124 ffffea0000f1a3c8 ffffea00013cc2c8 ffff888148c558f8 raw: 0000000000000213 ffff888039837cb0 00000002ffffffff ffff88802a550000 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 15796, tgid 15795 (syz-executor.4), ts 2061325067733, free_ts 2061268852306 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+0x6b5/0x1da0 mm/shmem.c:1004 shmem_truncate_range mm/shmem.c:1113 [inline] shmem_evict_inode+0x29b/0xa60 mm/shmem.c:1241 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/0x9e0 fs/file_table.c:402 __do_sys_close fs/open.c:1587 [inline] __se_sys_close fs/open.c:1572 [inline] __x64_sys_close+0x7e/0x100 fs/open.c:1572 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 Memory state around the buggy address: ffff888082780f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888082780f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888082781000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888082781080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888082781100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 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