(syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 3 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 4 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 5 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 6 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 7 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 0 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 1 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 2 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 3 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 4 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 5 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 6 (syz.0.0,5372,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5372,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880451c4fb8, block: 7 ================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xd3/0x3f0 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff888011f7c058 by task syz.0.0/5372 CPU: 0 UID: 0 PID: 5372 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~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 ocfs2_fault+0xd3/0x3f0 fs/ocfs2/mmap.c:41 __do_fault+0x138/0x390 mm/memory.c:5152 do_read_fault mm/memory.c:5573 [inline] do_fault mm/memory.c:5707 [inline] do_pte_missing mm/memory.c:4234 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x3611/0x5440 mm/memory.c:6195 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0xb7/0x290 lib/strncpy_from_user.c:130 Code: 00 00 4c 89 f6 e8 a9 05 bf fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 e4 4c 89 fb <4f> 8b 34 27 48 b8 ff fe fe fe fe fe fe fe 4d 8d 3c 06 4d 89 f5 49 RSP: 0018:ffffc9000d287d30 EFLAGS: 00050246 RAX: ffffffff8500bc77 RBX: 0000200000000000 RCX: ffff88801fb1c880 RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: fffffffffffffff8 R08: ffff888012b1b1ff R09: 1ffff1100256363f R10: dffffc0000000000 R11: ffffed1002563640 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000fe0 R15: 0000200000000000 getname_flags+0xf3/0x540 fs/namei.c:157 getname include/linux/fs.h:2919 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1b22d8eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1b23c5e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f1b22fe5fa0 RCX: 00007f1b22d8eec9 RDX: 0000000000000002 RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f1b22e11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1b22fe6038 R14: 00007f1b22fe5fa0 R15: 00007ffc10c71fb8 Allocated by task 5373: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4191 [inline] slab_alloc_node mm/slub.c:4240 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4247 vm_area_alloc+0x24/0x140 mm/vma_init.c:31 __mmap_new_vma mm/vma.c:2461 [inline] __mmap_region mm/vma.c:2669 [inline] mmap_region+0xdc7/0x20c0 mm/vma.c:2739 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:580 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5372: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2422 [inline] slab_free_after_rcu_debug+0x129/0x2a0 mm/slub.c:4745 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 slab_free_hook mm/slub.c:2383 [inline] slab_free mm/slub.c:4695 [inline] kmem_cache_free+0x2f6/0x400 mm/slub.c:4797 remove_vma mm/vma.c:468 [inline] vms_complete_munmap_vmas+0x626/0x8a0 mm/vma.c:1293 __mmap_complete mm/vma.c:2532 [inline] __mmap_region mm/vma.c:2677 [inline] mmap_region+0x11db/0x20c0 mm/vma.c:2739 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:580 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888011f7c000 which belongs to the cache vm_area_struct of size 256 The buggy address is located 88 bytes inside of freed 256-byte region [ffff888011f7c000, ffff888011f7c100) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f7c memcg:ffff88801e907c01 ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888030412b40 ffffea00004619c0 dead000000000003 raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff88801e907c01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4736, tgid 4736 (rcS), ts 28442666141, free_ts 28435974730 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2492 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2660 new_slab mm/slub.c:2714 [inline] ___slab_alloc+0xbeb/0x1420 mm/slub.c:3901 __slab_alloc mm/slub.c:3992 [inline] __slab_alloc_node mm/slub.c:4067 [inline] slab_alloc_node mm/slub.c:4228 [inline] kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4247 vm_area_alloc+0x24/0x140 mm/vma_init.c:31 __mmap_new_vma mm/vma.c:2461 [inline] __mmap_region mm/vma.c:2669 [inline] mmap_region+0xdc7/0x20c0 mm/vma.c:2739 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:580 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 15 tgid 15 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 pagetable_free include/linux/mm.h:2898 [inline] pagetable_dtor_free include/linux/mm.h:2996 [inline] __tlb_remove_table+0x2d2/0x3b0 include/asm-generic/tlb.h:220 __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x283/0x870 kernel/softirq.c:579 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888011f7bf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888011f7bf80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc >ffff888011f7c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888011f7c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888011f7c100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4c 89 f6 mov %r14,%rsi 5: e8 a9 05 bf fc call 0xfcbf05b3 a: 49 83 fe 07 cmp $0x7,%r14 e: 0f 86 9d 00 00 00 jbe 0xb1 14: 48 89 1c 24 mov %rbx,(%rsp) 18: 4c 89 74 24 08 mov %r14,0x8(%rsp) 1d: 48 c7 c5 f8 ff ff ff mov $0xfffffffffffffff8,%rbp 24: 45 31 e4 xor %r12d,%r12d 27: 4c 89 fb mov %r15,%rbx * 2a: 4f 8b 34 27 mov (%r15,%r12,1),%r14 <-- trapping instruction 2e: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax 35: fe fe fe 38: 4d 8d 3c 06 lea (%r14,%rax,1),%r15 3c: 4d 89 f5 mov %r14,%r13 3f: 49 rex.WB