================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x92b/0x1ed0 fs/ext4/xattr.c:1767 Read of size 18446744073709551600 at addr ffff88804e8126b8 by task syz.0.0/5314 CPU: 0 UID: 0 PID: 5314 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 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:1767 ext4_xattr_ibody_set+0x262/0x710 fs/ext4/xattr.c:2277 ext4_destroy_inline_data_nolock+0x23a/0x5f0 fs/ext4/inline.c:471 ext4_convert_inline_data_to_extent+0x549/0xde0 fs/ext4/inline.c:630 ext4_write_begin+0x3bd/0x1900 fs/ext4/inode.c:1306 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4374 ext4_buffered_write_iter+0xd4/0x380 fs/ext4/file.c:354 ext4_file_write_iter+0xae4/0x1cd0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7feed859e159 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:00007feed943ffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007feed8826090 RCX: 00007feed859e159 RDX: 00000000fffffdef RSI: 00002000000000c0 RDI: 0000000000000009 RBP: 00007feed863506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007feed8826128 R14: 00007feed8826090 R15: 00007ffdc56d74d8 The buggy address belongs to the physical page: page: refcount:2 mapcount:0 mapping:ffff88801d025940 index:0xc pfn:0x4e812 memcg:ffff888042729200 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0x4fff58000004234(referenced|dirty|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff58000004234 ffffea00010bfe48 ffffea00013a0448 ffff88801d025940 raw: 000000000000000c ffff8880122e7700 00000002ffffffff ffff888042729200 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 5313, tgid 5312 (syz.0.0), ts 93747202764 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2577 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2587 filemap_alloc_folio_noprof+0x111/0x460 mm/filemap.c:1019 __filemap_get_folio_mpol+0x402/0x1000 mm/filemap.c:2018 __filemap_get_folio include/linux/pagemap.h:761 [inline] grow_dev_folio fs/buffer.c:858 [inline] grow_buffers fs/buffer.c:924 [inline] __getblk_slow fs/buffer.c:942 [inline] bdev_getblk+0x1f4/0x6e0 fs/buffer.c:1346 __getblk include/linux/buffer_head.h:378 [inline] sb_getblk include/linux/buffer_head.h:384 [inline] __ext4_get_inode_loc+0x56c/0xf40 fs/ext4/inode.c:4921 ext4_get_inode_loc fs/ext4/inode.c:5049 [inline] ext4_reserve_inode_write+0x18b/0x360 fs/ext4/inode.c:6511 __ext4_mark_inode_dirty+0x146/0x7b0 fs/ext4/inode.c:6699 ext4_mkdir+0x4ea/0xce0 fs/ext4/namei.c:3027 vfs_mkdir+0x40c/0x620 fs/namei.c:5410 filename_mkdirat+0x285/0x510 fs/namei.c:5443 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461 page last free pid 5275 tgid 5275 ts 93704631978 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __folio_put+0x4b3/0x590 mm/folio.c:106 folio_put include/linux/mm.h:2160 [inline] zpdesc_put mm/zpdesc.h:137 [inline] __free_zspage_lockless+0x2e2/0x460 mm/zsmalloc.c:915 zs_free+0xca0/0x1090 mm/zsmalloc.c:1570 zswap_entry_free+0x318/0x510 mm/zswap.c:768 zswap_load+0x3ca/0x4c0 mm/zswap.c:1641 swap_read_folio+0x926/0x11c0 mm/page_io.c:480 swap_cache_read_folio+0x8b/0x120 mm/swap_state.c:658 swap_cluster_readahead+0x392/0x630 mm/swap_state.c:849 swapin_readahead+0x1a3/0xc50 mm/swap_state.c:997 do_swap_page+0x3fb/0x4c10 mm/memory.c:4971 handle_pte_fault mm/memory.c:6561 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1398/0x3750 mm/memory.c:6876 do_user_addr_fault+0xa4f/0x1340 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 Memory state around the buggy address: ffff88804e812580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e812600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804e812680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88804e812700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e812780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================