loop4: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: use-after-free in __ocfs2_find_path+0x1ff/0x7e0 fs/ocfs2/alloc.c:1817 Read of size 4 at addr ffff88805e6b5000 by task syz.4.40/4369 CPU: 1 PID: 4369 Comm: syz.4.40 Not tainted 5.15.171-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 __ocfs2_find_path+0x1ff/0x7e0 fs/ocfs2/alloc.c:1817 ocfs2_find_leaf+0xcb/0x220 fs/ocfs2/alloc.c:1931 ocfs2_get_clusters_nocache+0x1a9/0xbe0 fs/ocfs2/extent_map.c:418 ocfs2_get_clusters+0x5b5/0xbc0 fs/ocfs2/extent_map.c:621 ocfs2_extent_map_get_blocks+0x248/0x7d0 fs/ocfs2/extent_map.c:668 ocfs2_read_virt_blocks+0x2ea/0xa10 fs/ocfs2/extent_map.c:977 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x437/0x26d0 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk+0xea/0x310 fs/ocfs2/dir.c:1982 ocfs2_lookup_ino_from_name+0xad/0x1e0 fs/ocfs2/dir.c:2004 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x314/0x7b0 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x328/0x720 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2276 [inline] ocfs2_fill_super+0x479e/0x58a0 fs/ocfs2/super.c:995 mount_bdev+0x2c9/0x3f0 fs/super.c:1400 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7efe6f5c2eba 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:00007efe6da38e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007efe6da38ef0 RCX: 00007efe6f5c2eba RDX: 0000000020004440 RSI: 0000000020000780 RDI: 00007efe6da38eb0 RBP: 0000000020004440 R08: 00007efe6da38ef0 R09: 0000000001000000 R10: 0000000001000000 R11: 0000000000000246 R12: 0000000020000780 R13: 00007efe6da38eb0 R14: 000000000000444a R15: 00000000200005c0 The buggy address belongs to the page: page:ffffea000179ad40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x5e6b5 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001797888 ffffea00017809c8 0000000000000000 raw: 0000000000000001 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 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 4346, ts 77332785479, free_ts 80627375362 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5464 alloc_pages_vma+0x39a/0x800 mm/mempolicy.c:2146 do_anonymous_page mm/memory.c:3825 [inline] handle_pte_fault mm/memory.c:4635 [inline] __handle_mm_fault mm/memory.c:4772 [inline] handle_mm_fault+0x2f49/0x5960 mm/memory.c:4870 do_user_addr_fault arch/x86/mm/fault.c:1357 [inline] handle_page_fault arch/x86/mm/fault.c:1445 [inline] exc_page_fault+0x271/0x700 arch/x86/mm/fault.c:1501 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433 release_pages+0x1bb9/0x1f40 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu+0xc8/0x170 mm/mmu_gather.c:247 zap_pte_range mm/memory.c:1445 [inline] zap_pmd_range mm/memory.c:1494 [inline] zap_pud_range mm/memory.c:1523 [inline] zap_p4d_range mm/memory.c:1544 [inline] unmap_page_range+0x214d/0x2630 mm/memory.c:1565 unmap_vmas+0x1f8/0x390 mm/memory.c:1642 exit_mmap+0x3b6/0x670 mm/mmap.c:3186 __mmput+0x112/0x3b0 kernel/fork.c:1126 exit_mm+0x688/0x7f0 kernel/exit.c:550 do_exit+0x626/0x2480 kernel/exit.c:861 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 Memory state around the buggy address: ffff88805e6b4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805e6b4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805e6b5000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88805e6b5080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805e6b5100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================