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BUG: KASAN: slab-use-after-free in ocfs2_fault+0xbe/0x270 fs/ocfs2/mmap.c:41
Read of size 8 at addr ffff888023a684e0 by task syz.1.54/5141

CPU: 1 PID: 5141 Comm: syz.1.54 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xca/0x250 mm/kasan/report.c:488
 kasan_report+0x118/0x150 mm/kasan/report.c:601
 ocfs2_fault+0xbe/0x270 fs/ocfs2/mmap.c:41
 __do_fault+0x10f/0x300 mm/memory.c:4556
 do_read_fault mm/memory.c:4921 [inline]
 do_fault mm/memory.c:5051 [inline]
 do_pte_missing mm/memory.c:3897 [inline]
 handle_pte_fault mm/memory.c:5381 [inline]
 __handle_mm_fault mm/memory.c:5524 [inline]
 handle_mm_fault+0xb41/0x2440 mm/memory.c:5689
 faultin_page mm/gup.c:1290 [inline]
 __get_user_pages+0x73d/0xf00 mm/gup.c:1589
 populate_vma_page_range+0x19d/0x220 mm/gup.c:2029
 __mm_populate+0x1dd/0x290 mm/gup.c:2132
 mm_populate include/linux/mm.h:3469 [inline]
 vm_mmap_pgoff+0x212/0x2e0 mm/util.c:578
 ksys_mmap_pgoff+0x2c4/0x3f0 mm/mmap.c:1443
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ae08f0ba9
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:00007f0ae0761038 EFLAGS: 00000246
 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f0ae0b37fa0 RCX: 00007f0ae08f0ba9
RDX: 00000000027ffff7 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007f0ae0973e19 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000004012011 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ae0b38038 R14: 00007f0ae0b37fa0 R15: 00007fff3cf9d818
 </TASK>

Allocated by task 5141:
 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:312 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3940 [inline]
 slab_alloc_node mm/slub.c:4002 [inline]
 kmem_cache_alloc_noprof+0x11d/0x330 mm/slub.c:4009
 vm_area_alloc+0x1f/0x190 kernel/fork.c:467
 mmap_region+0x910/0x1740 mm/mmap.c:2873
 do_mmap+0x63b/0xb60 mm/mmap.c:1397
 vm_mmap_pgoff+0x181/0x2e0 mm/util.c:573
 ksys_mmap_pgoff+0x2c4/0x3f0 mm/mmap.c:1443
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 426:
 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:579
 poison_slab_object+0xef/0x170 mm/kasan/common.c:240
 __kasan_slab_free+0x3c/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4438 [inline]
 kmem_cache_free+0x11d/0x390 mm/slub.c:4513
 rcu_do_batch kernel/rcu/tree.c:2535 [inline]
 rcu_core+0xb1e/0x12a0 kernel/rcu/tree.c:2809
 handle_softirqs+0x19d/0x500 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0x45/0xe0 kernel/softirq.c:637
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x92/0xb0 arch/x86/kernel/apic/apic.c:1043
 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:541
 __call_rcu_common kernel/rcu/tree.c:3072 [inline]
 call_rcu+0x131/0x7a0 kernel/rcu/tree.c:3176
 remove_vma mm/mmap.c:148 [inline]
 remove_mt mm/mmap.c:2344 [inline]
 do_vmi_align_munmap+0xb5e/0x1030 mm/mmap.c:2687
 __vm_munmap+0x14e/0x270 mm/mmap.c:3038
 __do_sys_munmap mm/mmap.c:3055 [inline]
 __se_sys_munmap mm/mmap.c:3052 [inline]
 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3052
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888023a68460
 which belongs to the cache vm_area_struct of size 160
The buggy address is located 128 bytes inside of
 freed 160-byte region [ffff888023a68460, ffff888023a68500)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23a68
memcg:ffff8880251ab101
flags: 0x80000000000000(node=0|zone=1)
page_type: 0xffffefff(slab)
raw: 0080000000000000 ffff88800daabb40 ffffea000094cf80 dead000000000004
raw: 0000000000000000 0000000000120012 00000001ffffefff ffff8880251ab101
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 2604, tgid 2604 (modprobe), ts 42024732188, free_ts 42002542608
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x16e/0x1a0 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x2255/0x22f0 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x1d3/0x420 mm/page_alloc.c:4683
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x46/0x100 mm/slub.c:2265
 allocate_slab+0x5d/0x290 mm/slub.c:2428
 new_slab mm/slub.c:2481 [inline]
 ___slab_alloc+0xa3c/0x1150 mm/slub.c:3667
 __slab_alloc mm/slub.c:3757 [inline]
 __slab_alloc_node mm/slub.c:3810 [inline]
 slab_alloc_node mm/slub.c:3990 [inline]
 kmem_cache_alloc_noprof+0x1c9/0x330 mm/slub.c:4009
 vm_area_dup+0x21/0x130 kernel/fork.c:482
 __split_vma+0xef/0x940 mm/mmap.c:2394
 split_vma mm/mmap.c:2466 [inline]
 vma_modify+0x228/0x2f0 mm/mmap.c:2507
 vma_modify_flags include/linux/mm.h:3352 [inline]
 mprotect_fixup+0x2c4/0x7f0 mm/mprotect.c:637
 do_mprotect_pkey+0x5c4/0x8a0 mm/mprotect.c:820
 __do_sys_mprotect mm/mprotect.c:841 [inline]
 __se_sys_mprotect mm/mprotect.c:838 [inline]
 __x64_sys_mprotect+0x7b/0x90 mm/mprotect.c:838
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 2602 tgid 2602 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 free_unref_page+0xb00/0xbb0 mm/page_alloc.c:2588
 __slab_free+0x311/0x3a0 mm/slub.c:4349
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x150 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3940 [inline]
 slab_alloc_node mm/slub.c:4002 [inline]
 kmem_cache_alloc_noprof+0x11d/0x330 mm/slub.c:4009
 getname_flags+0xa5/0x440 fs/namei.c:139
 vfs_fstatat+0xb0/0xf0 fs/stat.c:303
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0xae/0x2f0 fs/stat.c:462
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8f/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023a68380: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023a68400: fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb
>ffff888023a68480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff888023a68500: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff888023a68580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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