================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0 Read of size 48 at addr ffff888065758ff0 by task syz-executor.3/5956 CPU: 0 PID: 5956 Comm: syz-executor.3 Not tainted 6.6.0-syzkaller-05843-g89ed67ef126c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 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+0x175/0x1b0 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_when_delete_left fs/reiserfs/do_balan.c:194 [inline] balance_leaf_when_delete fs/reiserfs/do_balan.c:272 [inline] balance_leaf+0x2292/0x12510 fs/reiserfs/do_balan.c:1393 do_balance+0x30d/0x8f0 fs/reiserfs/do_balan.c:1888 reiserfs_cut_from_item+0x1948/0x2580 fs/reiserfs/stree.c:1836 reiserfs_do_truncate+0x9b9/0x14c0 fs/reiserfs/stree.c:1971 reiserfs_truncate_file+0x4da/0x820 fs/reiserfs/inode.c:2302 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+0x29dd/0x3280 fs/namei.c:3779 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_creat fs/open.c:1531 [inline] __se_sys_creat fs/open.c:1525 [inline] __x64_sys_creat+0x123/0x160 fs/open.c:1525 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f64db27cae9 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:00007f64dbf240c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f64db39c050 RCX: 00007f64db27cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00007f64db2c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f64db39c050 R15: 00007ffe26e8da58 The buggy address belongs to the physical page: page:ffffea000195d600 refcount:2 mapcount:0 mapping:ffff888148c893f8 index:0x21c pfn:0x65758 memcg:ffff88801bf3e000 aops:def_blk_aops ino:700003 flags: 0xfff00000008124(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000008124 ffffea000189cc48 ffff88807ca37030 ffff888148c893f8 raw: 000000000000021c ffff888076644488 00000002ffffffff ffff88801bf3e000 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 5943, tgid 5941 (syz-executor.3), ts 902704565517, free_ts 902700357315 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426 folio_alloc+0x1e/0x60 mm/mempolicy.c:2313 filemap_alloc_folio+0xde/0x500 mm/filemap.c:976 __filemap_get_folio+0x431/0xbb0 mm/filemap.c:1936 grow_dev_page fs/buffer.c:1058 [inline] grow_buffers fs/buffer.c:1118 [inline] __getblk_slow fs/buffer.c:1145 [inline] __getblk_gfp+0x218/0x630 fs/buffer.c:1439 sb_getblk include/linux/buffer_head.h:344 [inline] get_empty_nodes+0x8c5/0xd70 fs/reiserfs/fix_node.c:890 fix_nodes+0x261b/0x8ce0 fs/reiserfs/fix_node.c:2663 reiserfs_paste_into_item+0x654/0x870 fs/reiserfs/stree.c:2129 reiserfs_get_block+0x2250/0x5130 fs/reiserfs/inode.c:1069 __block_write_begin_int+0x54d/0x1ac0 fs/buffer.c:2120 reiserfs_write_begin+0x24d/0x520 fs/reiserfs/inode.c:2767 generic_cont_expand_simple+0x18b/0x2a0 fs/buffer.c:2476 reiserfs_setattr+0x57d/0x1140 fs/reiserfs/inode.c:3298 notify_change+0xb99/0xe60 fs/attr.c:499 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2451 release_pages+0x2113/0x23f0 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+0x6ad/0x19c0 mm/shmem.c:1022 shmem_truncate_range mm/shmem.c:1114 [inline] shmem_evict_inode+0x29b/0xa60 mm/shmem.c:1243 evict+0x2a4/0x620 fs/inode.c:664 __dentry_kill+0x436/0x650 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+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88 Memory state around the buggy address: ffff888065758f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888065758f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888065759000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888065759080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888065759100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================