================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0 Read of size 48 at addr ffff888077d6aff0 by task syz-executor898/5069 CPU: 0 PID: 5069 Comm: syz-executor898 Not tainted 6.6.0-syzkaller-16201-gb57b17e88bf5 #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+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+0xacc/0xc30 fs/reiserfs/stree.c:2260 reiserfs_get_block+0x20ae/0x5130 fs/reiserfs/inode.c:868 __block_write_begin_int+0x54d/0x1ac0 fs/buffer.c:2119 reiserfs_write_begin+0x24d/0x520 fs/reiserfs/inode.c:2767 generic_perform_write+0x31b/0x630 mm/filemap.c:3918 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4039 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x792/0xb20 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 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: 0033:0x7f2690d00229 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffda522ff68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2690d00229 RDX: 000000000000000f RSI: 0000000020000100 RDI: 0000000000000006 RBP: 0000000000000000 R08: 00007ffda522ffa0 R09: 00007ffda522ffa0 R10: 00007ffda522ffa0 R11: 0000000000000246 R12: 00007ffda522ff8c R13: 0000000000000005 R14: 431bde82d7b634db R15: 00007ffda522ffc0 The buggy address belongs to the physical page: page:ffffea0001df5a80 refcount:3 mapcount:0 mapping:ffff88801b083678 index:0x214 pfn:0x77d6a memcg:ffff888016262000 aops:def_blk_aops ino:700000 flags: 0xfff00000008104(referenced|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000008104 0000000000000000 dead000000000122 ffff88801b083678 raw: 0000000000000214 ffff88807ca31570 00000003ffffffff ffff888016262000 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 5069, tgid 5069 (syz-executor898), ts 59867192679, free_ts 59866961221 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+0x339a/0x3530 mm/page_alloc.c:3312 __alloc_pages+0x255/0x670 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+0x9e8/0xc30 fs/reiserfs/stree.c:2239 indirect2direct+0x699/0xc00 fs/reiserfs/tail_conversion.c:283 maybe_indirect_to_direct fs/reiserfs/stree.c:1585 [inline] reiserfs_cut_from_item+0xba6/0x2580 fs/reiserfs/stree.c:1692 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 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+0x92a/0xa50 mm/page_alloc.c:2347 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2533 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] truncate_inode_pages_range+0x45d/0x11a0 mm/truncate.c:371 truncate_inode_pages mm/truncate.c:448 [inline] truncate_pagecache mm/truncate.c:741 [inline] truncate_setsize+0xcf/0xf0 mm/truncate.c:766 reiserfs_setattr+0xbbc/0x1140 fs/reiserfs/inode.c:3387 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+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff888077d6af00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888077d6af80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888077d6b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888077d6b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888077d6b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================