(syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 3 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 4 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 5 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 6 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 7 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 0 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 1 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 2 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 3 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 4 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 5 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 6 (syz.0.0,5322,0):ocfs2_read_blocks:239 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_clusters:627 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_extent_map_get_blocks:681 ERROR: status = -12 (syz.0.0,5322,0):ocfs2_get_block:153 ERROR: get_blocks() failed, inode: 0xffff8880436fcfb8, block: 7 ================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xd3/0x3f0 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff8880119cf918 by task syz.0.0/5322 CPU: 0 UID: 0 PID: 5322 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:5280 do_read_fault mm/memory.c:5698 [inline] do_fault mm/memory.c:5832 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault+0x35e3/0x5400 mm/memory.c:6318 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487 do_user_addr_fault+0x764/0x1380 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: 35 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 e9 4f 35 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000f5b79d8 EFLAGS: 00050206 RAX: 00007ffffffff001 RBX: 0000000000000068 RCX: 0000000000000068 RDX: 0000000000000001 RSI: 0000200000000680 RDI: ffffc9000f5b7a40 RBP: ffffc9000f5b7e98 R08: ffffc9000f5b7aa7 R09: 1ffff92001eb6f54 R10: dffffc0000000000 R11: fffff52001eb6f55 R12: 1ffff92001eb6f44 R13: ffff888032f2da02 R14: ffffc9000f5b7a40 R15: 0000200000000680 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:178 [inline] _copy_from_user+0x7a/0xb0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] kvm_vm_ioctl+0x5e4/0xc60 virt/kvm/kvm_main.c:5164 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1cf9f8eec9 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:00007f1cfadac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1cfa1e5fa0 RCX: 00007f1cf9f8eec9 RDX: 0000200000000680 RSI: 000000004068aea3 RDI: 0000000000000004 RBP: 00007f1cfa011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1cfa1e6038 R14: 00007f1cfa1e5fa0 R15: 00007fffedd9c848 Allocated by task 5322: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5272 vm_area_alloc+0x24/0x140 mm/vma_init.c:32 __mmap_new_vma mm/vma.c:2461 [inline] __mmap_region mm/vma.c:2670 [inline] mmap_region+0xdcd/0x2110 mm/vma.c:2740 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5322: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2523 [inline] slab_free_after_rcu_debug+0x12c/0x2a0 mm/slub.c:6669 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559 slab_free_hook mm/slub.c:2484 [inline] slab_free mm/slub.c:6611 [inline] kmem_cache_free+0x4a2/0x690 mm/slub.c:6721 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:2678 [inline] mmap_region+0x11e1/0x2110 mm/vma.c:2740 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880119cf8c0 which belongs to the cache vm_area_struct of size 256 The buggy address is located 88 bytes inside of freed 256-byte region [ffff8880119cf8c0, ffff8880119cf9c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119cf memcg:ffff888011a93e81 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b6d5b40 ffffea00004622c0 dead000000000002 raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff888011a93e81 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 4697, tgid 4697 (hostname), ts 26894959096, free_ts 26356755048 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3039 [inline] allocate_slab+0x96/0x3a0 mm/slub.c:3212 new_slab mm/slub.c:3266 [inline] ___slab_alloc+0xe94/0x18a0 mm/slub.c:4636 __kmem_cache_alloc_bulk+0x1e2/0x590 mm/slub.c:7375 refill_sheaf mm/slub.c:2617 [inline] __pcs_replace_empty_main+0x292/0x540 mm/slub.c:5025 alloc_from_pcs mm/slub.c:5123 [inline] slab_alloc_node mm/slub.c:5250 [inline] kmem_cache_alloc_noprof+0x453/0x6e0 mm/slub.c:5272 vm_area_dup+0x2b/0x680 mm/vma_init.c:123 __split_vma+0x1a9/0xa00 mm/vma.c:515 vms_gather_munmap_vmas+0x4c6/0x12e0 mm/vma.c:1380 __mmap_prepare mm/vma.c:2359 [inline] __mmap_region mm/vma.c:2652 [inline] mmap_region+0x722/0x2110 mm/vma.c:2740 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906 __free_pages mm/page_alloc.c:5302 [inline] free_reserved_page+0xce/0x120 mm/page_alloc.c:6213 free_reserved_area+0x90/0x190 mm/page_alloc.c:6199 free_init_pages arch/x86/mm/init.c:937 [inline] free_kernel_image_pages+0xa2/0x100 arch/x86/mm/init.c:953 kernel_init+0x31/0x1d0 init/main.c:1492 ret_from_fork+0x4bc/0x870 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: ffff8880119cf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880119cf880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff8880119cf900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880119cf980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880119cfa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 35 04 00 66 2e xor $0x2e660004,%eax 5: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) c: 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: e9 4f 35 04 00 jmp 0x43580 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W