================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xe0/0x494 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff0000d6f1f650 by task syz.0.113/7175 CPU: 0 UID: 0 PID: 7175 Comm: syz.0.113 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:378 [inline] print_report+0x198/0x538 mm/kasan/report.c:489 kasan_report+0xd8/0x138 mm/kasan/report.c:602 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 ocfs2_fault+0xe0/0x494 fs/ocfs2/mmap.c:41 __do_fault+0x11c/0x374 mm/memory.c:4907 do_read_fault mm/memory.c:5322 [inline] do_fault mm/memory.c:5456 [inline] do_pte_missing mm/memory.c:3979 [inline] handle_pte_fault+0x2e68/0x5890 mm/memory.c:5801 __handle_mm_fault mm/memory.c:5944 [inline] handle_mm_fault+0xf0c/0x17b0 mm/memory.c:6112 do_page_fault+0x570/0x10a8 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 7214: 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:568 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:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_noprof+0x254/0x410 mm/slub.c:4175 vm_area_alloc+0x30/0x1bc kernel/fork.c:472 __mmap_new_vma mm/vma.c:2340 [inline] __mmap_region+0x11f8/0x2180 mm/vma.c:2456 mmap_region+0x1f4/0x370 mm/mmap.c:1348 do_mmap+0x8b0/0xfd0 mm/mmap.c:496 vm_mmap_pgoff+0x1a0/0x38c mm/util.c:580 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:542 __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 7187: 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:582 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kmem_cache_free+0x198/0x554 mm/slub.c:4715 __vm_area_free+0xfc/0x148 kernel/fork.c:515 vm_area_free_rcu_cb+0x80/0xa4 kernel/fork.c:526 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x898/0x1b5c kernel/rcu/tree.c:2823 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2840 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 __do_softirq+0x14/0x20 kernel/softirq.c:595 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:544 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:554 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x104/0xb00 kernel/rcu/tree.c:3190 vm_area_free+0x28/0x38 kernel/fork.c:533 remove_vma mm/vma.c:387 [inline] vms_complete_munmap_vmas+0x5b0/0x810 mm/vma.c:1201 do_vmi_align_munmap+0x440/0x5ac mm/vma.c:1444 do_vmi_munmap+0x1c4/0x248 mm/vma.c:1492 __vm_munmap+0x1ec/0x408 mm/mmap.c:1368 __do_sys_munmap mm/mmap.c:1385 [inline] __se_sys_munmap mm/mmap.c:1382 [inline] __arm64_sys_munmap+0x64/0x7c mm/mmap.c:1382 __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 ffff0000d6f1f5d0 which belongs to the cache vm_area_struct of size 184 The buggy address is located 128 bytes inside of freed 184-byte region [ffff0000d6f1f5d0, ffff0000d6f1f688) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116f1f memcg:ffff0000cfb6c101 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c1894b40 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000100010 00000001f5000000 ffff0000cfb6c101 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d6f1f500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d6f1f580: 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb >ffff0000d6f1f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d6f1f680: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ffff0000d6f1f700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================