loop5: 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 ffff8880569b0000 by task syz.5.934/7323 CPU: 0 UID: 0 PID: 7323 Comm: syz.5.934 Not tainted 6.12.0-rc1-syzkaller-00349-g8f602276d390 #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/0xbf0 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+0x313/0xb20 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/0x2780 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xff/0x360 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+0x2f47/0x5750 fs/ocfs2/super.c:994 mount_bdev+0x20c/0x2d0 fs/super.c:1679 legacy_get_tree+0xf0/0x190 fs/fs_context.c:662 vfs_get_tree+0x92/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4b7337f79a 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:00007f4b740f7e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4b740f7ef0 RCX: 00007f4b7337f79a RDX: 0000000020004440 RSI: 0000000020000780 RDI: 00007f4b740f7eb0 RBP: 0000000020004440 R08: 00007f4b740f7ef0 R09: 0000000001000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000000020000780 R13: 00007f4b740f7eb0 R14: 000000000000444a R15: 00000000200005c0 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:ffff8880578fbe68 index:0xb9a pfn:0x569b0 memcg:ffff888058c2e000 aops:shmem_aops ino:464 dentry name(?):"memfd:syzkaller" flags: 0xfff6000002003c(referenced|uptodate|dirty|lru|swapbacked|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff6000002003c ffffea00015a6c48 ffffea00014b93c8 ffff8880578fbe68 raw: 0000000000000b9a 0000000000000000 00000001ffffffff ffff888058c2e000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 7329, tgid 7328 (syz.4.939), ts 166350573245, free_ts 166340768557 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3045/0x3190 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 folio_alloc_mpol_noprof+0x36/0x50 mm/mempolicy.c:2283 shmem_alloc_folio mm/shmem.c:1774 [inline] shmem_alloc_and_add_folio+0x49b/0x13d0 mm/shmem.c:1813 shmem_get_folio_gfp+0x5a9/0x20a0 mm/shmem.c:2335 shmem_get_folio mm/shmem.c:2441 [inline] shmem_write_begin+0x17e/0x460 mm/shmem.c:3046 generic_perform_write+0x346/0x6d0 mm/filemap.c:4054 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3221 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xa6f/0xc90 fs/read_write.c:683 ksys_write+0x183/0x2b0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 7337 tgid 7336 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_folios+0xf12/0x18d0 mm/page_alloc.c:2686 folios_put_refs+0x76c/0x860 mm/swap.c:1007 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __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 vms_clear_ptes+0x437/0x530 mm/vma.c:1096 vms_complete_munmap_vmas+0x208/0x910 mm/vma.c:1140 do_vmi_align_munmap+0x613/0x730 mm/vma.c:1349 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1397 __vm_munmap+0x24c/0x480 mm/mmap.c:1600 __do_sys_munmap mm/mmap.c:1617 [inline] __se_sys_munmap mm/mmap.c:1614 [inline] __x64_sys_munmap+0x68/0x80 mm/mmap.c:1614 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880569aff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880569aff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880569b0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880569b0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880569b0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================