EXT4-fs error (device loop6): ext4_find_d[ 953.419076][T31711] EXT4-fs error (device loop6): ext4_find_dest_de:2050: inode #2: block 13: comm syz.6.2176: bad entry in directory: directory entry overrun - offset=92, inode=0, rec_len=1024, size=1024 fake=0 EXT4-fs error (device loop6): ext4_validate_block_bitmap:432: comm syz.6.2176: bg 0: block 18: invalid block bitmap ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763 Read of size 18446744073709551600 at addr ffff88803a27d6b8 by task syz.6.2176/31711 CPU: 1 UID: 0 PID: 31711 Comm: syz.6.2176 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1763 ext4_xattr_ibody_set+0x262/0x710 fs/ext4/xattr.c:2275 ext4_destroy_inline_data_nolock+0x23a/0x5f0 fs/ext4/inline.c:472 ext4_convert_inline_data_to_extent+0x549/0xde0 fs/ext4/inline.c:631 ext4_write_begin+0x349/0x1850 fs/ext4/inode.c:1315 generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4363 ext4_buffered_write_iter+0xcc/0x370 fs/ext4/file.c:316 ext4_file_write_iter+0x94b/0x1c90 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_pwrite64 fs/read_write.c:794 [inline] __do_sys_pwrite64 fs/read_write.c:802 [inline] __se_sys_pwrite64 fs/read_write.c:799 [inline] __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:799 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa5e8c4ce59 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:00007fa5e6e9e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fa5e8ec5fa0 RCX: 00007fa5e8c4ce59 RDX: 0000000000000001 RSI: 0000200000000740 RDI: 0000000000000005 RBP: 00007fa5e8ce2e6f R08: 0000000000000000 R09: 0000000000000000 R10: 000000000004fed3 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa5e8ec6038 R14: 00007fa5e8ec5fa0 R15: 00007ffd785ab9d8 The buggy address belongs to the physical page: page: refcount:3 mapcount:0 mapping:ffff888022858a20 index:0xc pfn:0x3a27d memcg:ffff888059f18d00 aops:def_blk_aops ino:700006 dentry name(?):"" flags: 0x80000000004114(referenced|dirty|active|private|node=0|zone=1) raw: 0080000000004114 0000000000000000 dead000000000122 ffff888022858a20 raw: 000000000000000c ffff888069088120 00000003ffffffff ffff888059f18d00 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_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 31711, tgid 31709 (syz.6.2176), ts 953408349210, free_ts 953399889181 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x262a/0x26a0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_pages_mpol+0xce/0x280 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xd2/0x2f0 mm/mempolicy.c:2581 folio_alloc_noprof+0x22/0xc0 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x111/0x4d0 mm/filemap.c:1014 __filemap_get_folio_mpol+0x33f/0xf50 mm/filemap.c:2013 __filemap_get_folio include/linux/pagemap.h:763 [inline] grow_dev_folio fs/buffer.c:960 [inline] grow_buffers fs/buffer.c:1026 [inline] __getblk_slow fs/buffer.c:1044 [inline] bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1439 __getblk include/linux/buffer_head.h:382 [inline] sb_getblk include/linux/buffer_head.h:388 [inline] __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4891 ext4_get_inode_loc fs/ext4/inode.c:5019 [inline] ext4_reserve_inode_write+0x18b/0x360 fs/ext4/inode.c:6424 __ext4_mark_inode_dirty+0x13e/0x700 fs/ext4/inode.c:6602 ext4_mkdir+0x4fa/0xca0 fs/ext4/namei.c:3025 vfs_mkdir+0x402/0x620 fs/namei.c:5272 filename_mkdirat+0x289/0x520 fs/namei.c:5305 __do_sys_mkdirat fs/namei.c:5326 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5323 page last free pid 31635 tgid 31634 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] free_unref_folios+0xcd4/0x1910 mm/page_alloc.c:3011 folios_put_refs+0x815/0x920 mm/swap.c:1057 folio_batch_release include/linux/folio_batch.h:101 [inline] shmem_undo_range+0x4e6/0x15d0 mm/shmem.c:1149 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x280/0xa80 mm/shmem.c:1407 evict+0x624/0xb50 fs/inode.c:828 dentry_kill+0x1b9/0x880 fs/dcache.c:826 finish_dput+0x1a/0x260 fs/dcache.c:1001 __fput+0x699/0xa80 fs/file_table.c:520 fput_close_sync+0x11f/0x240 fs/file_table.c:617 __do_sys_close fs/open.c:1538 [inline] __se_sys_close fs/open.c:1523 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1523 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803a27d580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803a27d600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88803a27d680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88803a27d700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88803a27d780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================