================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0 Read of size 48 at addr ffff88803b235ff0 by task syz-executor.2/11774 CPU: 0 PID: 11774 Comm: syz-executor.2 Not tainted 6.7.0-rc2-syzkaller-00206-gb46ae77f6787 #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 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 do_sys_ftruncate+0x2f3/0x390 fs/open.c:194 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7efd18c7cae9 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:00007efd199480c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007efd18d9bf80 RCX: 00007efd18c7cae9 RDX: 0000000000000000 RSI: 00000000000003c4 RDI: 0000000000000004 RBP: 00007efd18cc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007efd18d9bf80 R15: 00007ffea1abb068 The buggy address belongs to the physical page: page:ffffea0000ec8d40 refcount:2 mapcount:0 mapping:ffff888148cc58f8 index:0x214 pfn:0x3b235 memcg:ffff888076b9e000 aops:def_blk_aops ino:700002 flags: 0xfff00000008124(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000008124 ffffea0000f6ef08 ffffea000118dbc8 ffff888148cc58f8 raw: 0000000000000214 ffff88803aa312b8 00000002ffffffff ffff888076b9e000 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 11774, tgid 11773 (syz-executor.2), ts 464707097706, free_ts 464674166983 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+0x246/0x6d0 fs/buffer.c:1429 __getblk include/linux/buffer_head.h:358 [inline] sb_getblk include/linux/buffer_head.h:364 [inline] get_empty_nodes+0x719/0xd90 fs/reiserfs/fix_node.c:890 fix_nodes+0x261b/0x8ce0 fs/reiserfs/fix_node.c:2663 reiserfs_insert_item+0x9ea/0xc30 fs/reiserfs/stree.c:2239 reiserfs_new_directory+0x5c5/0x9a0 fs/reiserfs/inode.c:1840 reiserfs_new_inode+0x1238/0x1cb0 fs/reiserfs/inode.c:2062 reiserfs_mkdir+0x5b0/0x8f0 fs/reiserfs/namei.c:843 vfs_mkdir+0x2f1/0x4b0 fs/namei.c:4106 do_mkdirat+0x264/0x3a0 fs/namei.c:4129 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:88 Memory state around the buggy address: ffff88803b235f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803b235f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88803b236000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88803b236080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803b236100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================