REISERFS (device loop0): Using r5 hash to sort names REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x739/0xca0 Read of size 104 at addr ffff8880729f6fd8 by task syz-executor366/5077 CPU: 1 PID: 5077 Comm: syz-executor366 Not tainted 6.1.0-syzkaller-14446-g8395ae05cb5a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x1f0 mm/kasan/report.c:417 kasan_report+0xcd/0x100 mm/kasan/report.c:517 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 memcpy+0x25/0x60 mm/kasan/shadow.c:65 leaf_paste_in_buffer+0x739/0xca0 leaf_copy_dir_entries+0x6e2/0xbf0 fs/reiserfs/lbalance.c:108 leaf_copy_boundary_item+0xb7c/0x20f0 fs/reiserfs/lbalance.c:168 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline] leaf_move_items+0xc74/0x1330 fs/reiserfs/lbalance.c:726 leaf_shift_left+0xb7/0x420 fs/reiserfs/lbalance.c:750 balance_leaf_left fs/reiserfs/do_balan.c:616 [inline] balance_leaf+0x1579/0x123a0 fs/reiserfs/do_balan.c:1409 do_balance+0x2d6/0x8d0 fs/reiserfs/do_balan.c:1888 reiserfs_insert_item+0xb54/0xcb0 fs/reiserfs/stree.c:2261 reiserfs_get_block+0x20a2/0x5180 fs/reiserfs/inode.c:868 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991 reiserfs_write_begin+0x247/0x510 fs/reiserfs/inode.c:2775 generic_cont_expand_simple+0x151/0x250 fs/buffer.c:2347 reiserfs_setattr+0x642/0x1200 fs/reiserfs/inode.c:3305 notify_change+0xe50/0x1100 fs/attr.c:482 do_truncate+0x200/0x2f0 fs/open.c:65 do_sys_ftruncate+0x2b0/0x350 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc83331f9e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdd3843518 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fc83331f9e9 RDX: 00007fc83331f9e9 RSI: 0000000002007ffb RDI: 0000000000000006 RBP: 0000000000000000 R08: 00007ffdd3843540 R09: 00007ffdd3843540 R10: 00007ffdd3843540 R11: 0000000000000246 R12: 00007ffdd384353c R13: 00007ffdd3843570 R14: 00007ffdd3843550 R15: 0000000000000003 The buggy address belongs to the physical page: page:ffffea0001ca7d80 refcount:2 mapcount:0 mapping:ffff888140d3bef8 index:0x213 pfn:0x729f6 memcg:ffff88813fe70000 aops:def_blk_aops ino:700000 flags: 0xfff00000002032(referenced|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002032 ffffea0001cacb08 ffffea0000817c08 ffff888140d3bef8 raw: 0000000000000213 ffff888072d1c1d0 00000002ffffffff ffff88813fe70000 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 5077, tgid 5077 (syz-executor366), ts 57739720943, free_ts 57554460694 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 folio_alloc+0x1a/0x50 mm/mempolicy.c:2295 filemap_alloc_folio+0xca/0x2c0 mm/filemap.c:972 __filemap_get_folio+0x892/0x1250 mm/filemap.c:1966 pagecache_get_page+0x28/0x250 mm/folio-compat.c:98 find_or_create_page include/linux/pagemap.h:612 [inline] grow_dev_page+0xba/0x920 fs/buffer.c:946 grow_buffers fs/buffer.c:1011 [inline] __getblk_slow fs/buffer.c:1038 [inline] __getblk_gfp+0x16c/0x290 fs/buffer.c:1333 sb_getblk include/linux/buffer_head.h:356 [inline] search_by_key+0x406/0x49c0 fs/reiserfs/stree.c:672 reiserfs_read_locked_inode+0x223/0x2990 fs/reiserfs/inode.c:1549 reiserfs_fill_super+0x128a/0x24a0 fs/reiserfs/super.c:2071 mount_bdev+0x26c/0x3a0 fs/super.c:1359 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page_list+0xb2/0x830 mm/page_alloc.c:3510 release_pages+0x233e/0x25e0 mm/swap.c:1076 __pagevec_release+0x7d/0xf0 mm/swap.c:1096 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] truncate_inode_pages_range+0x452/0x1690 mm/truncate.c:372 kill_bdev block/bdev.c:76 [inline] blkdev_flush_mapping+0x153/0x2c0 block/bdev.c:662 blkdev_put_whole block/bdev.c:693 [inline] blkdev_put+0x4a5/0x730 block/bdev.c:953 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 cleanup_mnt+0x494/0x520 fs/namespace.c:1291 task_work_run+0x243/0x300 kernel/task_work.c:179 ptrace_notify+0x29a/0x340 kernel/signal.c:2354 ptrace_report_syscall include/linux/ptrace.h:411 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:473 [inline] syscall_exit_work+0x8c/0xe0 kernel/entry/common.c:251 syscall_exit_to_user_mode_prepare+0x63/0xc0 kernel/entry/common.c:278 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0xa/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880729f6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880729f6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880729f7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880729f7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880729f7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================