================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2905 Read of size 4 at addr ffff8881250d0000 by task syz-executor830/293 CPU: 1 PID: 293 Comm: syz-executor830 Not tainted 6.1.90-syzkaller-00025-gfaf32723dc54 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 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_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2905 ext4_evict_inode+0xef9/0x1550 fs/ext4/inode.c:296 evict+0x2a3/0x630 fs/inode.c:666 iput_final fs/inode.c:1791 [inline] iput+0x616/0x690 fs/inode.c:1817 d_delete_notify include/linux/fsnotify.h:286 [inline] vfs_rmdir+0x3c2/0x500 fs/namei.c:4205 do_rmdir+0x3ab/0x630 fs/namei.c:4253 __do_sys_rmdir fs/namei.c:4272 [inline] __se_sys_rmdir fs/namei.c:4270 [inline] __x64_sys_rmdir+0x49/0x50 fs/namei.c:4270 x64_sys_call+0x274/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:85 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9d04e7adc7 Code: 73 01 c3 48 c7 c1 b8 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 54 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4a9487a8 EFLAGS: 00000207 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9d04e7adc7 RDX: 0000000000008890 RSI: 0000000000000000 RDI: 00007fff4a949950 RBP: 0000000000000065 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007fff4a949950 R13: 0000555556861740 R14: 431bde82d7b634db R15: 00007fff4a94bad0 The buggy address belongs to the physical page: page:ffffea0004943400 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1250d0 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea0004943448 ffffea00048dde48 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 0x8140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO|__GFP_CMA), pid 233, tgid 233 (sshd), ts 14403302780, free_ts 14456547255 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:5714 __folio_alloc+0x15/0x40 mm/page_alloc.c:5746 __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] do_anonymous_page mm/memory.c:4245 [inline] handle_pte_fault mm/memory.c:5125 [inline] __handle_mm_fault mm/memory.c:5269 [inline] handle_mm_fault+0x1cf7/0x30e0 mm/memory.c:5409 do_user_addr_fault arch/x86/mm/fault.c:1354 [inline] handle_page_fault arch/x86/mm/fault.c:1497 [inline] exc_page_fault+0x3b3/0x700 arch/x86/mm/fault.c:1553 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:315 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1e0/0x3f0 mm/mmu_gather.c:361 unmap_region+0x2c1/0x310 mm/mmap.c:2403 do_mas_align_munmap+0xd05/0x1400 mm/mmap.c:2670 do_mas_munmap+0x23e/0x2b0 mm/mmap.c:2728 __vm_munmap+0x263/0x3a0 mm/mmap.c:3018 __do_sys_munmap mm/mmap.c:3044 [inline] __se_sys_munmap mm/mmap.c:3040 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:3040 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8881250cff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881250cff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881250d0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881250d0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881250d0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs (loop0): unmounting filesystem. 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EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem.