syzbot

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BUG: KASAN: use-after-free in ocfs2_fault+0xc8/0x4a4 fs/ocfs2/mmap.c:41
Read of size 8 at addr ffff0000ce1ab070 by task syz.4.14/4433

CPU: 0 PID: 4433 Comm: syz.4.14 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 ocfs2_fault+0xc8/0x4a4 fs/ocfs2/mmap.c:41
 __do_fault+0x11c/0x3d8 mm/memory.c:4280
 do_read_fault mm/memory.c:4631 [inline]
 do_fault mm/memory.c:4760 [inline]
 handle_pte_fault mm/memory.c:5031 [inline]
 __handle_mm_fault mm/memory.c:5173 [inline]
 handle_mm_fault+0x1ac0/0x2fd4 mm/memory.c:5294
 __do_page_fault arch/arm64/mm/fault.c:499 [inline]
 do_page_fault+0x310/0x99c arch/arm64/mm/fault.c:583
 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667
 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:803
 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
 el1h_64_sync_handler+0x80/0xcc arch/arm64/kernel/entry-common.c:427
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580
 fault_in_readable+0x2c8/0x3e0 mm/gup.c:1915
 fault_in_iov_iter_readable+0xc0/0x2c4 lib/iov_iter.c:356
 generic_perform_write+0x35c/0x4b0 mm/filemap.c:3836
 __generic_file_write_iter+0x168/0x37c mm/filemap.c:3974
 ocfs2_file_write_iter+0x1300/0x1bf4 fs/ocfs2/file.c:2469
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x5ac/0x7c4 fs/read_write.c:584
 ksys_write+0x120/0x210 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 4457:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x43c mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x234/0x318 mm/slub.c:3422
 vm_area_alloc+0x2c/0xe0 kernel/fork.c:459
 __mmap_region mm/mmap.c:2741 [inline]
 mmap_region+0xb64/0x1860 mm/mmap.c:2904
 do_mmap+0x978/0x10dc mm/mmap.c:1424
 vm_mmap_pgoff+0x184/0x284 mm/util.c:520
 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1470
 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline]
 __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline]
 __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 4461:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1750
 slab_free mm/slub.c:3661 [inline]
 kmem_cache_free+0x11c/0x324 mm/slub.c:3683
 vm_area_free+0x58/0x12c kernel/fork.c:486
 remove_vma mm/mmap.c:143 [inline]
 remove_mt mm/mmap.c:2307 [inline]
 do_mas_align_munmap+0xc1c/0xeec mm/mmap.c:2583
 do_mas_munmap mm/mmap.c:2638 [inline]
 __mmap_region mm/mmap.c:2686 [inline]
 mmap_region+0x64c/0x1860 mm/mmap.c:2904
 do_mmap+0x978/0x10dc mm/mmap.c:1424
 vm_mmap_pgoff+0x184/0x284 mm/util.c:520
 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1470
 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline]
 __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline]
 __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000ce1ab000
 which belongs to the cache vm_area_struct of size 152
The buggy address is located 112 bytes inside of
 152-byte region [ffff0000ce1ab000, ffff0000ce1ab098)

The buggy address belongs to the physical page:
page:000000003cd2817d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000ce1ab0d8 pfn:0x10e1ab
memcg:ffff0000d5541401
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 fffffc000360c148 fffffc0003753ac8 ffff0000c0851680
raw: ffff0000ce1ab0d8 0000000000120007 00000001ffffffff ffff0000d5541401
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ce1aaf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ce1aaf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000ce1ab000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff0000ce1ab080: fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb
 ffff0000ce1ab100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
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