================================================================== BUG: KASAN: use-after-free in __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85 Read of size 2 at addr ffff888143bc0008 by task syz-executor.1/310 CPU: 0 PID: 310 Comm: syz-executor.1 Not tainted 6.1.78-syzkaller-00132-g92704e00b599 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report_generic.c:349 __ext4_check_dir_entry+0x700/0x880 fs/ext4/dir.c:85 empty_inline_dir+0x54f/0xa30 fs/ext4/inline.c:1856 ext4_empty_dir+0x121/0xa10 fs/ext4/namei.c:3079 ext4_rmdir+0x30b/0xad0 fs/ext4/namei.c:3176 vfs_rmdir+0x398/0x500 fs/namei.c:4192 do_rmdir+0x3ab/0x630 fs/namei.c:4253 __do_sys_unlinkat fs/namei.c:4433 [inline] __se_sys_unlinkat fs/namei.c:4427 [inline] __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4427 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe33887c6c7 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd010bd888 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fe33887c6c7 RDX: 0000000000000200 RSI: 00007ffd010bea30 RDI: 00000000ffffff9c RBP: 00007fe3388c8336 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffd010bea30 R13: 00007fe3388c8336 R14: 0000000000007402 R15: 000000000000001a The buggy address belongs to the physical page: page:ffffea00050ef000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x143bc0 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00050efa48 ffffea0004c841c8 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 436, tgid 436 (syz-executor.1), ts 29734459087, free_ts 30240252565 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5712 __folio_alloc+0x15/0x40 mm/page_alloc.c:5744 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] alloc_page_vma include/linux/gfp.h:283 [inline] wp_page_copy+0x261/0x1690 mm/memory.c:3181 do_wp_page+0xc25/0xdf0 handle_pte_fault mm/memory.c:5119 [inline] __handle_mm_fault mm/memory.c:5243 [inline] handle_mm_fault+0x15a2/0x2f40 mm/memory.c:5383 do_user_addr_fault arch/x86/mm/fault.c:1363 [inline] handle_page_fault arch/x86/mm/fault.c:1506 [inline] exc_page_fault+0x3b3/0x700 arch/x86/mm/fault.c:1562 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:570 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3646 release_pages+0xf7f/0xfe0 mm/swap.c:1063 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:314 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0xfe/0x1d0 mm/mmu_gather.c:261 zap_pte_range mm/memory.c:1537 [inline] zap_pmd_range mm/memory.c:1586 [inline] zap_pud_range mm/memory.c:1615 [inline] zap_p4d_range mm/memory.c:1636 [inline] unmap_page_range+0x219d/0x2480 mm/memory.c:1657 unmap_single_vma mm/memory.c:1703 [inline] unmap_vmas+0x4e4/0x660 mm/memory.c:1743 exit_mmap+0x2d1/0x940 mm/mmap.c:3336 __mmput+0x95/0x310 kernel/fork.c:1298 mmput+0x56/0x170 kernel/fork.c:1321 exit_mm kernel/exit.c:566 [inline] do_exit+0xb29/0x2b80 kernel/exit.c:862 do_group_exit+0x21a/0x2d0 kernel/exit.c:1025 get_signal+0x169d/0x1820 kernel/signal.c:2880 arch_do_signal_or_restart+0xb0/0x16f0 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x74/0xa0 kernel/entry/common.c:168 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:204 Memory state around the buggy address: ffff888143bbff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888143bbff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888143bc0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888143bc0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888143bc0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop1): empty_inline_dir:1858: inode #12: block 7: comm syz-executor.1: bad entry in directory: rec_len is smaller than minimal - offset=60, inode=0, rec_len=0, size=68 fake=0 EXT4-fs warning (device loop1): empty_inline_dir:1865: bad inline directory (dir #12) - inode 0, rec_len 0, name_len 0inline size 68