================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xba6/0xbb0 fs/ext4/xattr.c:2904 Read of size 4 at addr ffff888127838000 by task syz-executor/434 CPU: 1 PID: 434 Comm: syz-executor Not tainted 6.1.134-syzkaller-1169266-g228e0f23bdeb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x71/0x210 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:427 kasan_report+0x122/0x150 mm/kasan/report.c:531 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 ext4_xattr_delete_inode+0xba6/0xbb0 fs/ext4/xattr.c:2904 ext4_evict_inode+0xe58/0x1460 fs/ext4/inode.c:296 evict+0x493/0x890 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x620/0x670 fs/inode.c:1860 d_delete_notify include/linux/fsnotify.h:292 [inline] vfs_rmdir+0x3bf/0x500 fs/namei.c:4203 do_rmdir+0x259/0x6a0 fs/namei.c:4251 __do_sys_unlinkat fs/namei.c:4431 [inline] __se_sys_unlinkat fs/namei.c:4425 [inline] __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4425 x64_sys_call+0x79f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5bcbd79457 Code: 73 01 c3 48 c7 c1 a8 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe0b21e2c8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f5bcbd79457 RDX: 0000000000000200 RSI: 00007ffe0b21f470 RDI: 00000000ffffff9c RBP: 00007f5bcbde77b4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffe0b21f470 R13: 00007f5bcbde77b4 R14: 000000000000ce80 R15: 00007ffe0b221620 The buggy address belongs to the physical page: page:ffffea00049e0e00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x127838 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00049e0e88 ffffea0004aeb608 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 384, tgid 384 (udevd), ts 53001936003, free_ts 53002228040 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637 prep_new_page+0x1c/0x110 mm/page_alloc.c:2644 get_page_from_freelist+0x2c6e/0x2ce0 mm/page_alloc.c:4539 __alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5838 __folio_alloc+0x12/0x40 mm/page_alloc.c:5870 __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:4272 [inline] handle_pte_fault mm/memory.c:5158 [inline] __handle_mm_fault mm/memory.c:5302 [inline] handle_mm_fault+0x18ef/0x2640 mm/memory.c:5442 do_user_addr_fault+0x63b/0x1050 arch/x86/mm/fault.c:1374 handle_page_fault arch/x86/mm/fault.c:1466 [inline] exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1545 [inline] free_pcp_prepare mm/page_alloc.c:1619 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3581 free_unref_page_list+0xba/0x7c0 mm/page_alloc.c:3729 release_pages+0xad1/0xb20 mm/swap.c:1043 free_pages_and_swap_cache+0x86/0xa0 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+0x1aa/0x370 mm/mmu_gather.c:361 unmap_region+0x28d/0x2e0 mm/mmap.c:2402 do_mas_align_munmap+0xb94/0x11b0 mm/mmap.c:2668 do_mas_munmap+0x241/0x2b0 mm/mmap.c:2726 __vm_munmap+0x19f/0x2f0 mm/mmap.c:3025 __do_sys_munmap mm/mmap.c:3051 [inline] __se_sys_munmap mm/mmap.c:3047 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:3047 x64_sys_call+0x8a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888127837f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888127837f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888127838000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888127838080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127838100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem.