================================================================== BUG: KASAN: slab-use-after-free in ntfs_read_mft fs/ntfs3/inode.c:80 [inline] BUG: KASAN: slab-use-after-free in ntfs_iget5+0x35f2/0x38e0 fs/ntfs3/inode.c:542 Read of size 2 at addr ffff88803fb23a3e by task syz.0.0/5327 CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 ntfs_read_mft fs/ntfs3/inode.c:80 [inline] ntfs_iget5+0x35f2/0x38e0 fs/ntfs3/inode.c:542 ntfs_dir_emit fs/ntfs3/dir.c:337 [inline] ntfs_read_hdr+0x7c3/0xc80 fs/ntfs3/dir.c:385 ntfs_readdir+0x6f4/0xe40 fs/ntfs3/dir.c:504 iterate_dir+0x399/0x570 fs/readdir.c:110 __do_sys_getdents64 fs/readdir.c:399 [inline] __se_sys_getdents64+0xf1/0x280 fs/readdir.c:384 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd4a7b9cdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd4a8ad4fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fd4a7e16090 RCX: 00007fd4a7b9cdd9 RDX: 0000000000001020 RSI: 0000200000003cc0 RDI: 0000000000000004 RBP: 00007fd4a7c32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd4a7e16128 R14: 00007fd4a7e16090 R15: 00007ffdc6b8da08 Allocated by task 5326: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5295 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5307 kmalloc_noprof include/linux/slab.h:954 [inline] mi_init+0x76/0xe0 fs/ntfs3/record.c:105 ntfs_read_mft fs/ntfs3/inode.c:55 [inline] ntfs_iget5+0x36a/0x38e0 fs/ntfs3/inode.c:542 dir_search_u+0x1fd/0x2e0 fs/ntfs3/dir.c:265 ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85 __lookup_slow+0x2b7/0x410 fs/namei.c:1915 lookup_slow+0x53/0x70 fs/namei.c:1932 walk_component fs/namei.c:2278 [inline] lookup_last fs/namei.c:2785 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2809 filename_lookup+0x256/0x5d0 fs/namei.c:2838 do_fchownat+0xfa/0x250 fs/open.c:800 __do_sys_chown fs/open.c:824 [inline] __se_sys_chown fs/open.c:822 [inline] __x64_sys_chown+0x82/0xa0 fs/open.c:822 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 12: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6246 [inline] kfree+0x1c5/0x640 mm/slub.c:6561 ni_try_remove_attr_list+0xd78/0xf30 fs/ntfs3/frecord.c:-1 ni_write_inode+0xa27/0xff0 fs/ntfs3/frecord.c:3191 write_inode fs/fs-writeback.c:1584 [inline] __writeback_single_inode+0x75a/0x10e0 fs/fs-writeback.c:1827 writeback_sb_inodes+0x979/0x19d0 fs/fs-writeback.c:2056 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2132 wb_writeback+0x459/0xb00 fs/fs-writeback.c:2243 wb_check_start_all fs/fs-writeback.c:2369 [inline] wb_do_writeback fs/fs-writeback.c:2395 [inline] wb_workfn+0x921/0xf10 fs/fs-writeback.c:2428 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88803fb23800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 574 bytes inside of freed 1024-byte region [ffff88803fb23800, ffff88803fb23c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3fb20 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801ac41dc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801ac41dc0 dead000000000122 0000000000000000 head: 0000000000000000 0000000800080008 00000000f5000000 0000000000000000 head: 04fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5326, tgid 5325 (syz.0.0), ts 86101843144, free_ts 29619165653 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x339/0x3d0 mm/slub.c:7251 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] __do_kmalloc_node mm/slub.c:5294 [inline] __kmalloc_noprof+0x474/0x760 mm/slub.c:5307 kmalloc_noprof include/linux/slab.h:954 [inline] mi_init+0x76/0xe0 fs/ntfs3/record.c:105 ntfs_read_mft fs/ntfs3/inode.c:55 [inline] ntfs_iget5+0x36a/0x38e0 fs/ntfs3/inode.c:542 dir_search_u+0x1fd/0x2e0 fs/ntfs3/dir.c:265 ntfs_lookup+0x100/0x1d0 fs/ntfs3/namei.c:85 __lookup_slow+0x2b7/0x410 fs/namei.c:1915 lookup_slow+0x53/0x70 fs/namei.c:1932 walk_component fs/namei.c:2278 [inline] lookup_last fs/namei.c:2785 [inline] path_lookupat+0x3f5/0x8c0 fs/namei.c:2809 filename_lookup+0x256/0x5d0 fs/namei.c:2838 do_fchownat+0xfa/0x250 fs/open.c:800 page last free pid 804 tgid 804 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943 vfree+0x1d1/0x2f0 mm/vmalloc.c:3472 delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3392 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88803fb23900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803fb23980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803fb23a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803fb23a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803fb23b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================