================================================================== BUG: KASAN: slab-use-after-free in ntfs_show_options+0x639/0x800 fs/ntfs3/super.c:761 Read of size 4 at addr ffff8880293bb9d4 by task syz-executor151/5970 CPU: 0 UID: 0 PID: 5970 Comm: syz-executor151 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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_show_options+0x639/0x800 fs/ntfs3/super.c:761 show_mountinfo+0x981/0xb70 fs/proc_namespace.c:187 seq_read_iter+0x8d6/0xcb0 fs/seq_file.c:273 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x59e/0xa90 fs/read_write.c:574 ksys_read+0x156/0x270 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 RIP: 0033:0x7fcbe52183fe Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08 RSP: 002b:00007fcbde1aa198 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fcbde1ab6c0 RCX: 00007fcbe52183fe RDX: 0000000000001000 RSI: 00007fcbde1aa200 RDI: 0000000000000012 RBP: 00007fcbe525d056 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcbde1aa200 R13: 0000000000000011 R14: 00007ffdd52256a0 R15: 00007ffdd5225788 Allocated by task 5975: 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] __kmalloc_cache_noprof+0x3d2/0x6b0 mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] ntfs_init_fs_context+0x55/0x570 fs/ntfs3/super.c:1862 alloc_fs_context+0x9a3/0xd00 fs/fs_context.c:295 do_remount fs/namespace.c:3392 [inline] path_mount+0xc5e/0x1040 fs/namespace.c:4153 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5974: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 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:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6692 put_fs_context+0x123/0xb00 fs/fs_context.c:498 do_remount fs/namespace.c:3419 [inline] path_mount+0xef9/0x1040 fs/namespace.c:4153 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880293bb9c0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 20 bytes inside of freed 32-byte region [ffff8880293bb9c0, ffff8880293bb9e0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880293bb740 pfn:0x293bb flags: 0x80000000000200(workingset|node=0|zone=1) page_type: f5(slab) raw: 0080000000000200 ffff88813ffb3780 ffffea0000c72010 ffffea0000bdd2d0 raw: ffff8880293bb740 000000080040003b 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5406, tgid 5406 (dhcpcd), ts 67741145436, free_ts 67461584725 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x262a/0x26a0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3380 new_slab mm/slub.c:3426 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x468/0x6b0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] slab_free_hook mm/slub.c:2629 [inline] slab_free mm/slub.c:6377 [inline] kmem_cache_free+0x156/0x6c0 mm/slub.c:6504 remove_vma mm/vma.c:473 [inline] vms_complete_munmap_vmas+0x897/0xbe0 mm/vma.c:1361 do_vmi_align_munmap+0x3bd/0x4d0 mm/vma.c:1604 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1652 __vm_munmap+0x241/0x3e0 mm/vma.c:3288 __do_sys_munmap mm/mmap.c:1079 [inline] __se_sys_munmap mm/mmap.c:1076 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1076 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 20 tgid 20 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x10e7/0x11c0 mm/page_alloc.c:2950 __tlb_remove_table_free mm/mmu_gather.c:228 [inline] tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:291 rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core kernel/rcu/tree.c:2897 [inline] rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985 smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160 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: ffff8880293bb880: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff8880293bb900: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff8880293bb980: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff8880293bba00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff8880293bba80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ==================================================================