REISERFS warning: read_super_block: reiserfs filesystem is deprecated and scheduled to be removed from the kernel in 2025 REISERFS (device loop4): found reiserfs format "3.5" with non-standard journal REISERFS (device loop4): using ordered data mode reiserfs: using flush barriers REISERFS (device loop4): journal params: device loop4, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop4): checking transaction log (loop4) REISERFS (device loop4): Using tea hash to sort names ================================================================== BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] BUG: KASAN: use-after-free in search_by_entry_key+0x80a/0x940 fs/reiserfs/namei.c:165 Read of size 4 at addr ffff88804e1fe004 by task syz-executor.4/16241 CPU: 0 PID: 16241 Comm: syz-executor.4 Not tainted 6.6.0-syzkaller-14651-gd2f51b3516da #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+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0x80a/0x940 fs/reiserfs/namei.c:165 reiserfs_find_entry+0x1dc/0xe70 fs/reiserfs/namei.c:322 reiserfs_lookup+0x1f5/0x690 fs/reiserfs/namei.c:368 __lookup_slow+0x24d/0x450 fs/namei.c:1694 lookup_one_len+0x17d/0x1b0 fs/namei.c:2746 reiserfs_lookup_privroot+0x94/0x200 fs/reiserfs/xattr.c:977 reiserfs_fill_super+0x20f9/0x3150 fs/reiserfs/super.c:2174 mount_bdev+0x1f3/0x2e0 fs/super.c:1650 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8c/0x370 fs/super.c:1771 do_new_mount fs/namespace.c:3337 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3664 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount fs/namespace.c:3863 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f653b47e1ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f653c17dee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f653c17df80 RCX: 00007f653b47e1ea RDX: 0000000020000100 RSI: 0000000020000040 RDI: 00007f653c17df40 RBP: 0000000020000100 R08: 00007f653c17df80 R09: 000000000000800c R10: 000000000000800c R11: 0000000000000202 R12: 0000000020000040 R13: 00007f653c17df40 R14: 0000000000001120 R15: 0000000020000300 The buggy address belongs to the physical page: page:ffffea0001387f80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x4e1fe flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea0001387fc8 ffff8880b9842630 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x100cca(GFP_HIGHUSER_MOVABLE), pid 16162, tgid 16161 (syz-executor.4), ts 1556097461478, free_ts 1556677687193 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0xa25/0x36c0 mm/page_alloc.c:3312 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4568 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 shmem_alloc_folio+0x10d/0x140 mm/shmem.c:1613 shmem_alloc_and_add_folio+0x147/0x7b0 mm/shmem.c:1653 shmem_get_folio_gfp+0x623/0x1350 mm/shmem.c:2037 shmem_get_folio mm/shmem.c:2119 [inline] shmem_write_begin+0x15a/0x360 mm/shmem.c:2702 generic_perform_write+0x278/0x600 mm/filemap.c:3918 shmem_file_write_iter+0x110/0x140 mm/shmem.c:2878 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x64f/0xdf0 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b 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+0x4f8/0xa90 mm/page_alloc.c:2347 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2533 release_pages+0x32a/0x14e0 mm/swap.c:1042 __folio_batch_release+0x77/0xe0 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x57a/0x1030 mm/shmem.c:1004 shmem_truncate_range mm/shmem.c:1096 [inline] shmem_evict_inode+0x39f/0xba0 mm/shmem.c:1224 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1775 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1801 iput+0x5c/0x80 fs/inode.c:1791 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:733 [inline] dput+0x8b7/0xf80 fs/dcache.c:913 __fput+0x3b9/0xbb0 fs/file_table.c:402 task_work_run+0x14d/0x240 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x215/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 Memory state around the buggy address: ffff88804e1fdf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e1fdf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804e1fe000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88804e1fe080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804e1fe100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================