REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x635/0xab0 Read of size 48 at addr ffff888073c29ff0 by task syz-executor140/5047 CPU: 0 PID: 5047 Comm: syz-executor140 Not tainted 6.6.0-rc3-syzkaller-00165-g3b517966c561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 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+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:2259 add_save_link+0x479/0x7c0 fs/reiserfs/super.c:495 reiserfs_truncate_file+0x4bd/0x820 fs/reiserfs/inode.c:2305 reiserfs_setattr+0xbc9/0x1140 fs/reiserfs/inode.c:3392 notify_change+0xb99/0xe60 fs/attr.c:499 do_truncate+0x220/0x300 fs/open.c:66 handle_truncate fs/namei.c:3298 [inline] do_open fs/namei.c:3643 [inline] path_openat+0x2959/0x3180 fs/namei.c:3796 do_filp_open+0x234/0x490 fs/namei.c:3823 do_sys_openat2+0x13e/0x1d0 fs/open.c:1422 do_sys_open fs/open.c:1437 [inline] __do_sys_openat fs/open.c:1453 [inline] __se_sys_openat fs/open.c:1448 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1448 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0d1daa6229 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:00007ffc16842658 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0d1daa6229 RDX: 000000000000275a RSI: 0000000020000200 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007ffc16842690 R09: 00007ffc16842690 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1684267c R13: 0000000000000003 R14: 431bde82d7b634db R15: 00007ffc168426b0 The buggy address belongs to the physical page: page:ffffea0001cf0a40 refcount:2 mapcount:0 mapping:ffff888148974d78 index:0x214 pfn:0x73c29 memcg:ffff888015e52000 aops:def_blk_aops ino:700000 flags: 0xfff00000008124(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000008124 ffffea0001d397c8 ffffea0001cf0e88 ffff888148974d78 raw: 0000000000000214 ffff888076ea5910 00000002ffffffff ffff888015e52000 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 5047, tgid 5047 (syz-executor140), ts 74127507592, free_ts 74127042651 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:2308 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_insert_item+0x9e8/0xc30 fs/reiserfs/stree.c:2238 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:2306 reiserfs_setattr+0xbc9/0x1140 fs/reiserfs/inode.c:3392 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] 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:3391 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:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888073c29f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888073c29f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888073c2a000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888073c2a080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888073c2a100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================