EXT4-fs error (device loop2): ext4_xattr_inode_iget:409: comm syz.2.16: error while reading EA inode 1 err=-117 EXT4-fs (loop2): 1 orphan inode deleted EXT4-fs (loop2): mounted filesystem without journal. Quota mode: none. ================================================================== BUG: KASAN: use-after-free in ext4_insert_dentry+0x388/0x710 fs/ext4/namei.c:2155 Write of size 250 at addr ffff888127418f18 by task syz.2.16/483 CPU: 1 PID: 483 Comm: syz.2.16 Not tainted 6.1.134-syzkaller-1169247-g0c1a07d9c284 #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/0x158 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 memcpy+0x44/0x70 mm/kasan/shadow.c:66 ext4_insert_dentry+0x388/0x710 fs/ext4/namei.c:2155 add_dirent_to_buf+0x2ac/0x670 fs/ext4/namei.c:2200 make_indexed_dir+0xe55/0x14a0 fs/ext4/namei.c:2398 ext4_add_entry+0xb45/0xd70 fs/ext4/namei.c:2504 ext4_mkdir+0x4da/0xc50 fs/ext4/namei.c:3081 vfs_mkdir+0x386/0x570 fs/namei.c:4105 do_mkdirat+0x171/0x4c0 fs/namei.c:4130 __do_sys_mkdirat fs/namei.c:4145 [inline] __se_sys_mkdirat fs/namei.c:4143 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4143 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 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: 0033:0x7feef1580849 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007feef23ac058 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007feef1745fa0 RCX: 00007feef1580849 RDX: 0000000000000000 RSI: 00000000200005c0 RDI: ffffffffffffff9c RBP: 00007feef15f3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007feef1745fa0 R15: 00007fff626a3238 The buggy address belongs to the physical page: page:ffffea00049d0600 refcount:3 mapcount:0 mapping:ffff88810be285d0 index:0x3f pfn:0x127418 memcg:ffff8881121a0000 aops:def_blk_aops ino:700002 flags: 0x420000000000204a(referenced|dirty|workingset|private|zone=1) raw: 420000000000204a 0000000000000000 dead000000000122 ffff88810be285d0 raw: 000000000000003f ffff88810bf81dc8 00000003ffffffff ffff8881121a0000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 483, tgid 482 (syz.2.16), ts 55622231380, free_ts 55570102366 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] filemap_alloc_folio include/linux/pagemap.h:513 [inline] __filemap_get_folio+0x6ec/0x980 mm/filemap.c:2018 pagecache_get_page+0x2b/0x110 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:654 [inline] grow_dev_page fs/buffer.c:989 [inline] grow_buffers fs/buffer.c:1054 [inline] __getblk_slow fs/buffer.c:1081 [inline] __getblk_gfp+0x217/0x7d0 fs/buffer.c:1376 sb_getblk include/linux/buffer_head.h:356 [inline] ext4_getblk+0x26c/0x6d0 fs/ext4/inode.c:899 ext4_bread+0x2b/0x170 fs/ext4/inode.c:945 ext4_append+0x2c3/0x560 fs/ext4/namei.c:83 make_indexed_dir+0x55d/0x14a0 fs/ext4/namei.c:2318 ext4_add_entry+0xb45/0xd70 fs/ext4/namei.c:2504 ext4_mkdir+0x4da/0xc50 fs/ext4/namei.c:3081 vfs_mkdir+0x386/0x570 fs/namei.c:4105 do_mkdirat+0x171/0x4c0 fs/namei.c:4130 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: ffff888127418f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888127418f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888127419000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888127419080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127419100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================