================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xe0/0x494 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff0000c6ef6b98 by task syz.0.128/7371 CPU: 0 UID: 0 PID: 7371 Comm: syz.0.128 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x198/0x550 mm/kasan/report.c:521 kasan_report+0xd8/0x138 mm/kasan/report.c:634 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 ocfs2_fault+0xe0/0x494 fs/ocfs2/mmap.c:41 __do_fault+0xf8/0x498 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault+0x2e90/0x5c94 mm/memory.c:5997 __handle_mm_fault mm/memory.c:6140 [inline] handle_mm_fault+0xf18/0x17bc mm/memory.c:6309 do_page_fault+0x580/0x11c8 arch/arm64/mm/fault.c:690 do_translation_fault+0xc4/0x114 arch/arm64/mm/fault.c:783 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el0_da+0x60/0x178 arch/arm64/kernel/entry-common.c:604 el0t_64_sync_handler+0xcc/0x108 arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Allocated by task 7372: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_noprof+0x254/0x410 mm/slub.c:4207 vm_area_alloc+0x2c/0x138 kernel/fork.c:441 __mmap_new_vma mm/vma.c:2359 [inline] __mmap_region mm/vma.c:2476 [inline] mmap_region+0x138c/0x2574 mm/vma.c:2554 do_mmap+0xbc8/0x1150 mm/mmap.c:561 vm_mmap_pgoff+0x30c/0x4ac mm/util.c:579 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:607 __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+0x98/0x2b8 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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 7368: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2389 [inline] slab_free_after_rcu_debug+0x11c/0x2f8 mm/slub.c:4696 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0x898/0x1b5c kernel/rcu/tree.c:2824 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2841 handle_softirqs+0x320/0xd34 kernel/softirq.c:579 __do_softirq+0x14/0x20 kernel/softirq.c:613 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 kasan_record_aux_stack+0xb4/0xcc mm/kasan/generic.c:548 slab_free_hook mm/slub.c:2350 [inline] slab_free mm/slub.c:4646 [inline] kmem_cache_free+0x368/0x554 mm/slub.c:4748 vm_area_free+0x108/0x17c kernel/fork.c:514 remove_vma mm/vma.c:430 [inline] vms_complete_munmap_vmas+0x5ac/0x808 mm/vma.c:1216 __mmap_complete mm/vma.c:2426 [inline] __mmap_region mm/vma.c:2492 [inline] mmap_region+0x125c/0x2574 mm/vma.c:2554 do_mmap+0xbc8/0x1150 mm/mmap.c:561 vm_mmap_pgoff+0x30c/0x4ac mm/util.c:579 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:607 __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+0x98/0x2b8 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+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000c6ef6b40 which belongs to the cache vm_area_struct of size 256 The buggy address is located 88 bytes inside of freed 256-byte region [ffff0000c6ef6b40, ffff0000c6ef6c40) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106ef6 memcg:ffff0000d88b0801 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c18a7b40 dead000000000100 dead000000000122 raw: 0000000000000000 00000000000c000c 00000000f5000000 ffff0000d88b0801 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c6ef6a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c6ef6b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff0000c6ef6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c6ef6c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff0000c6ef6c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================