================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xb02/0x2230 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff888116cef6b8 by task syz.2.3/323 CPU: 0 PID: 323 Comm: syz.2.3 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0xb02/0x2230 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x25b/0x720 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:620 [inline] ext4_try_to_write_inline_data+0x764/0x1330 fs/ext4/inline.c:761 ext4_write_begin+0x1f8/0xfc0 fs/ext4/inode.c:1207 generic_perform_write+0x32d/0x740 mm/filemap.c:3915 ext4_buffered_write_iter+0x38f/0x690 fs/ext4/file.c:285 ext4_file_write_iter+0x4b2/0x1540 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe93d39ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe93e2ec028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe93d615fa0 RCX: 00007fe93d39ce59 RDX: 00000000fffffdab RSI: 0000200000000000 RDI: 0000000000000007 RBP: 00007fe93d432e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe93d616038 R14: 00007fe93d615fa0 R15: 00007ffe94f057e8 The buggy address belongs to the physical page: page:ffffea00045b3bc0 refcount:2 mapcount:0 mapping:ffff88810b7114d0 index:0xc pfn:0x116cef memcg:ffff88810023a700 aops:def_blk_aops ino:700002 flags: 0x560000000000205a(referenced|dirty|lru|workingset|private|zone=1) raw: 560000000000205a ffffea0004cd7a48 ffffea0004cd8bc8 ffff88810b7114d0 raw: 000000000000000c ffff888114a5e150 00000002ffffffff ffff88810023a700 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 334, tgid 321 (syz.2.3), ts 24861257629, free_ts 7986677272 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 __folio_alloc+0x12/0x40 mm/page_alloc.c:5963 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] filemap_alloc_folio include/linux/pagemap.h:515 [inline] __filemap_get_folio+0x6fe/0xa70 mm/filemap.c:2021 pagecache_get_page+0x2b/0x110 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:656 [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+0x211/0x7c0 fs/buffer.c:1376 sb_getblk include/linux/buffer_head.h:356 [inline] __ext4_get_inode_loc+0x45f/0xd60 fs/ext4/inode.c:4527 ext4_get_inode_loc fs/ext4/inode.c:4655 [inline] ext4_reserve_inode_write+0x12a/0x2e0 fs/ext4/inode.c:5944 __ext4_mark_inode_dirty+0xa8/0x5d0 fs/ext4/inode.c:6121 ext4_mkdir+0x4f5/0xc90 fs/ext4/namei.c:3079 vfs_mkdir+0x39c/0x580 fs/namei.c:4113 open_or_create_special_dir+0xf1/0x1f0 fs/incfs/vfs.c:488 incfs_mount_fs+0x42f/0x890 fs/incfs/vfs.c:1890 legacy_get_tree+0xfe/0x1a0 fs/fs_context.c:632 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1580 [inline] free_pcp_prepare mm/page_alloc.c:1654 [inline] free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page_list+0x117/0x8d0 mm/page_alloc.c:3772 release_pages+0xc7e/0xce0 mm/swap.c:1053 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:316 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+0x1b2/0x380 mm/mmu_gather.c:361 exit_mmap+0x41d/0xc10 mm/mmap.c:3384 __mmput+0x92/0x340 kernel/fork.c:1319 mmput+0x4b/0x150 kernel/fork.c:1343 exit_mm kernel/exit.c:569 [inline] do_exit+0xa51/0x2850 kernel/exit.c:874 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030 __do_sys_exit_group kernel/exit.c:1041 [inline] __se_sys_exit_group kernel/exit.c:1039 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1039 x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888116cef580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888116cef600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888116cef680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888116cef700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888116cef780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================