loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: use-after-free in __ocfs2_find_path+0x203/0x7e0 fs/ocfs2/alloc.c:1824 Read of size 4 at addr ffff88805ac76000 by task syz.0.15/5959 CPU: 0 UID: 0 PID: 5959 Comm: syz.0.15 Not tainted 6.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 __ocfs2_find_path+0x203/0x7e0 fs/ocfs2/alloc.c:1824 ocfs2_find_leaf+0xcf/0x230 fs/ocfs2/alloc.c:1938 ocfs2_get_clusters_nocache+0x1ad/0xbe0 fs/ocfs2/extent_map.c:418 ocfs2_get_clusters+0x5bd/0xbd0 fs/ocfs2/extent_map.c:621 ocfs2_extent_map_get_blocks+0x24c/0x7d0 fs/ocfs2/extent_map.c:668 ocfs2_read_virt_blocks+0x313/0xb10 fs/ocfs2/extent_map.c:983 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x43b/0x2760 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xff/0x350 fs/ocfs2/dir.c:1981 ocfs2_lookup_ino_from_name+0xb1/0x1e0 fs/ocfs2/dir.c:2003 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x305/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x32c/0x730 fs/ocfs2/super.c:457 ocfs2_initialize_super fs/ocfs2/super.c:2248 [inline] ocfs2_fill_super+0x2f57/0x5740 fs/ocfs2/super.c:994 mount_bdev+0x20a/0x2d0 fs/super.c:1693 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x290 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f87add7f79a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f87aeb2ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f87aeb2aef0 RCX: 00007f87add7f79a RDX: 0000000020004440 RSI: 0000000020000780 RDI: 00007f87aeb2aeb0 RBP: 0000000020004440 R08: 00007f87aeb2aef0 R09: 0000000001000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000000020000780 R13: 00007f87aeb2aeb0 R14: 000000000000444a R15: 00000000200005c0 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xc1 pfn:0x5ac76 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001b311c8 ffffea00018c2548 0000000000000000 raw: 00000000000000c1 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5945, tgid 5945 (dhcpcd-run-hook), ts 116822697960, free_ts 117153221864 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ee/0x220 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3a4e/0x3cb0 mm/page_alloc.c:3457 __alloc_pages_noprof+0x261/0x6a0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 folio_alloc_mpol_noprof mm/mempolicy.c:2283 [inline] vma_alloc_folio_noprof+0x12e/0x230 mm/mempolicy.c:2314 folio_prealloc+0x31/0x170 do_cow_fault mm/memory.c:5321 [inline] do_fault mm/memory.c:5433 [inline] do_pte_missing+0x636/0x4500 mm/memory.c:3965 handle_pte_fault mm/memory.c:5766 [inline] __handle_mm_fault mm/memory.c:5909 [inline] handle_mm_fault+0x1efd/0x3cf0 mm/memory.c:6077 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x408/0x810 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 5945 tgid 5945 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_folios+0xed7/0x1870 mm/page_alloc.c:2686 folios_put_refs+0x76c/0x860 mm/swap.c:1007 free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x4c3/0xc80 mm/mmap.c:1925 __mmput+0x115/0x380 kernel/fork.c:1347 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x28e0 kernel/exit.c:926 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e Memory state around the buggy address: ffff88805ac75f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805ac75f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805ac76000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805ac76080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805ac76100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================