================================================================== BUG: KASAN: slab-use-after-free in ocfs2_fault+0xeb/0x3e0 fs/ocfs2/mmap.c:41 Read of size 8 at addr ffff88807dbcc938 by task syz.3.36/6174 CPU: 1 UID: 0 PID: 6174 Comm: syz.3.36 Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 ocfs2_fault+0xeb/0x3e0 fs/ocfs2/mmap.c:41 __do_fault+0x135/0x390 mm/memory.c:4994 do_read_fault mm/memory.c:5414 [inline] do_fault mm/memory.c:5548 [inline] do_pte_missing mm/memory.c:4059 [inline] handle_pte_fault mm/memory.c:5893 [inline] __handle_mm_fault+0x40c8/0x6ef0 mm/memory.c:6036 handle_mm_fault+0x2dd/0x800 mm/memory.c:6205 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x1adf/0x4180 mm/gup.c:1491 populate_vma_page_range+0x266/0x340 mm/gup.c:1929 __mm_populate+0x27d/0x460 mm/gup.c:2032 mm_populate include/linux/mm.h:3377 [inline] vm_mmap_pgoff+0x390/0x530 mm/util.c:584 ksys_mmap_pgoff+0x4ee/0x720 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fde8078d169 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:00007fde81609038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fde809a5fa0 RCX: 00007fde8078d169 RDX: 00000000027ffff7 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007fde8080e2a0 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000004012011 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fde809a5fa0 R15: 00007ffe4b1c6438 Allocated by task 6174: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4138 [inline] slab_alloc_node mm/slub.c:4187 [inline] kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4194 vm_area_alloc+0x24/0x1d0 kernel/fork.c:472 __mmap_new_vma mm/vma.c:2345 [inline] __mmap_region mm/vma.c:2462 [inline] mmap_region+0x1b10/0x2fc0 mm/vma.c:2540 do_mmap+0xd42/0x1420 mm/mmap.c:561 vm_mmap_pgoff+0x2a2/0x530 mm/util.c:579 ksys_mmap_pgoff+0x4ee/0x720 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 24: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2376 [inline] slab_free mm/slub.c:4633 [inline] kmem_cache_free+0x197/0x410 mm/slub.c:4735 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2824 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561 do_softirq+0x11f/0x1e0 kernel/softirq.c:462 __local_bh_enable_ip+0x1be/0x200 kernel/softirq.c:389 spin_unlock_bh include/linux/spinlock.h:396 [inline] ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline] wg_packet_encrypt_worker+0x2ef/0x1810 drivers/net/wireguard/send.c:293 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3082 [inline] call_rcu+0x172/0xad0 kernel/rcu/tree.c:3202 remove_vma mm/vma.c:419 [inline] vms_complete_munmap_vmas+0x65b/0x8f0 mm/vma.c:1202 do_vmi_align_munmap+0x5f3/0x6f0 mm/vma.c:1445 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1493 __vm_munmap+0x37b/0x520 mm/vma.c:2956 __do_sys_munmap mm/mmap.c:1084 [inline] __se_sys_munmap mm/mmap.c:1081 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1081 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807dbcc8b8 which belongs to the cache vm_area_struct of size 184 The buggy address is located 128 bytes inside of freed 184-byte region [ffff88807dbcc8b8, ffff88807dbcc970) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7dbcc memcg:ffff88807cf7d001 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c28fb40 ffffea0001a14780 dead00000000000a raw: 0000000000000000 0000000000100010 00000000f5000000 ffff88807cf7d001 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5500, tgid 5500 (mkdir), ts 30605940706, free_ts 30303593439 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x368a/0x37d0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2446 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2610 new_slab mm/slub.c:2663 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3849 __slab_alloc+0x58/0xa0 mm/slub.c:3939 __slab_alloc_node mm/slub.c:4014 [inline] slab_alloc_node mm/slub.c:4175 [inline] kmem_cache_alloc_noprof+0x270/0x390 mm/slub.c:4194 vm_area_alloc+0x24/0x1d0 kernel/fork.c:472 __install_special_mapping mm/mmap.c:1494 [inline] _install_special_mapping+0x32/0x350 mm/mmap.c:1542 map_vdso+0x1e0/0x480 arch/x86/entry/vdso/vma.c:173 load_elf_binary+0x1cd5/0x28a0 fs/binfmt_elf.c:1277 search_binary_handler fs/exec.c:1773 [inline] exec_binprm fs/exec.c:1805 [inline] bprm_execve+0x97b/0x1440 fs/exec.c:1857 do_execveat_common+0x57c/0x710 fs/exec.c:1964 do_execve fs/exec.c:2038 [inline] __do_sys_execve fs/exec.c:2114 [inline] __se_sys_execve fs/exec.c:2109 [inline] __x64_sys_execve+0x94/0xb0 fs/exec.c:2109 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 page last free pid 5494 tgid 5494 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 pagetable_free include/linux/mm.h:2908 [inline] pagetable_dtor_free include/linux/mm.h:3006 [inline] __tlb_remove_table+0x36b/0x460 include/asm-generic/tlb.h:216 __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x79/0xf0 mm/mmu_gather.c:282 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2824 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Memory state around the buggy address: ffff88807dbcc800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ffff88807dbcc880: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb >ffff88807dbcc900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88807dbcc980: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00 ffff88807dbcca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ==================================================================