================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xc8/0x424 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff0000dfb33418 by task syz.0.1525/13806 CPU: 1 UID: 0 PID: 13806 Comm: syz.0.1525 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 ocfs2_fault+0xc8/0x424 fs/ocfs2/mmap.c:41 __do_fault+0x138/0x390 mm/memory.c:5280 do_shared_fault mm/memory.c:5762 [inline] do_fault mm/memory.c:5836 [inline] do_pte_missing mm/memory.c:4361 [inline] handle_pte_fault mm/memory.c:6177 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x19d0/0x4d80 mm/memory.c:6487 do_page_fault+0x57c/0x13cc arch/arm64/mm/fault.c:696 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:789 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:929 el1_abort+0x40/0x64 arch/arm64/kernel/entry-common.c:325 el1h_64_sync_handler+0x50/0xfc arch/arm64/kernel/entry-common.c:459 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:591 __arch_copy_to_user+0x190/0x240 arch/arm64/lib/copy_template.S:168 (P) copy_page_to_iter+0x24c/0x348 lib/iov_iter.c:362 copy_folio_to_iter include/linux/uio.h:204 [inline] filemap_read+0x664/0xea8 mm/filemap.c:2799 generic_file_read_iter+0xa0/0x450 mm/filemap.c:2940 ocfs2_file_read_iter+0x38c/0xa78 fs/ocfs2/file.c:2589 do_iter_readv_writev+0x4bc/0x720 fs/read_write.c:-1 vfs_readv+0x210/0x6d0 fs/read_write.c:1018 do_preadv fs/read_write.c:1132 [inline] __do_sys_preadv fs/read_write.c:1179 [inline] __se_sys_preadv fs/read_write.c:1174 [inline] __arm64_sys_preadv+0x170/0x278 fs/read_write.c:1174 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 13823: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4970 [inline] slab_alloc_node mm/slub.c:5280 [inline] kmem_cache_alloc_noprof+0x338/0x648 mm/slub.c:5287 vm_area_alloc+0x2c/0x138 mm/vma_init.c:32 __mmap_new_vma mm/vma.c:2461 [inline] __mmap_region mm/vma.c:2670 [inline] mmap_region+0xae8/0x1d28 mm/vma.c:2740 do_mmap+0x968/0xfac mm/mmap.c:558 vm_mmap_pgoff+0x2d8/0x45c mm/util.c:581 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:604 __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:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 13827: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 __kasan_save_free_info+0x58/0x70 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+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2539 [inline] slab_free_after_rcu_debug+0x120/0x2f8 mm/slub.c:6688 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0x840/0x17d0 kernel/rcu/tree.c:2861 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2878 handle_softirqs+0x328/0xc88 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:56 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:559 slab_free_hook mm/slub.c:2500 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x4a8/0x6dc mm/slub.c:6740 vm_area_free+0x108/0x17c mm/vma_init.c:151 remove_vma mm/vma.c:468 [inline] vms_complete_munmap_vmas+0x598/0x7e4 mm/vma.c:1293 __mmap_complete mm/vma.c:2532 [inline] __mmap_region mm/vma.c:2678 [inline] mmap_region+0xdd0/0x1d28 mm/vma.c:2740 do_mmap+0x968/0xfac mm/mmap.c:558 vm_mmap_pgoff+0x2d8/0x45c mm/util.c:581 ksys_mmap_pgoff+0x394/0x5b8 mm/mmap.c:604 __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:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000dfb333c0 which belongs to the cache vm_area_struct of size 256 The buggy address is located 88 bytes inside of freed 256-byte region [ffff0000dfb333c0, ffff0000dfb334c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11fb33 memcg:ffff0000cf88e681 ksm flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c18b4b40 fffffdffc35f7a00 dead000000000007 raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff0000cf88e681 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dfb33300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dfb33380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff0000dfb33400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dfb33480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff0000dfb33500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================