================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xa2f/0x1e90 fs/ext4/xattr.c:1708 Read of size 18446744073709551600 at addr ffff888050fbe2b8 by task syz.0.522/6052 CPU: 0 PID: 6052 Comm: syz.0.522 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0xa2f/0x1e90 fs/ext4/xattr.c:1708 ext4_xattr_ibody_set+0x250/0x690 fs/ext4/xattr.c:2215 ext4_destroy_inline_data_nolock+0x237/0x5e0 fs/ext4/inline.c:468 ext4_destroy_inline_data+0x7f/0xe0 fs/ext4/inline.c:1923 ext4_writepages+0x670/0x2f40 fs/ext4/inode.c:2763 do_writepages+0x3ba/0x640 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] __filemap_fdatawrite mm/filemap.c:427 [inline] filemap_flush+0xe0/0x140 mm/filemap.c:454 ext4_release_file+0x7e/0x300 fs/ext4/file.c:158 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f867b39cdd9 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:00007f867c231028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f867b616090 RCX: 00007f867b39cdd9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f867b432d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f867b616128 R14: 00007f867b616090 R15: 00007ffdaf3552c8 The buggy address belongs to the physical page: page:ffffea000143ef80 refcount:2 mapcount:0 mapping:ffff888140c8c9f8 index:0x2 pfn:0x50fbe memcg:ffff888075926000 aops:def_blk_aops ino:700000 flags: 0xfff58000002052(referenced|lru|workingset|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff58000002052 ffffea0001a27288 ffff88807b93a1f8 ffff888140c8c9f8 raw: 0000000000000002 ffff88805b6e9488 00000002ffffffff ffff888075926000 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 6052, tgid 6036 (syz.0.522), ts 229392928581, free_ts 228315644527 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292 filemap_alloc_folio+0xdb/0x480 mm/filemap.c:999 __filemap_get_folio+0x6ab/0xdb0 mm/filemap.c:1993 pagecache_get_page+0x26/0x250 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:648 [inline] grow_dev_page fs/buffer.c:946 [inline] grow_buffers fs/buffer.c:1011 [inline] __getblk_slow fs/buffer.c:1038 [inline] __getblk_gfp+0x2d8/0xb20 fs/buffer.c:1333 sb_getblk include/linux/buffer_head.h:356 [inline] __ext4_get_inode_loc+0x481/0xdf0 fs/ext4/inode.c:4525 ext4_get_inode_loc+0x7e/0xf0 fs/ext4/inode.c:4653 ext4_destroy_inline_data_nolock+0x13d/0x5e0 fs/ext4/inline.c:452 ext4_destroy_inline_data+0x7f/0xe0 fs/ext4/inline.c:1923 ext4_writepages+0x670/0x2f40 fs/ext4/inode.c:2763 do_writepages+0x3ba/0x640 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] __filemap_fdatawrite mm/filemap.c:427 [inline] filemap_flush+0xe0/0x140 mm/filemap.c:454 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554 release_pages+0x1fa6/0x2220 mm/swap.c:1035 __pagevec_release+0x6d/0xe0 mm/swap.c:1055 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x7c2/0x20c0 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x25b/0xa80 mm/shmem.c:1171 evict+0x4c9/0x8d0 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x5e0/0x920 fs/file_table.c:328 task_work_run+0x1d0/0x260 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x982/0x2480 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871 Memory state around the buggy address: ffff888050fbe180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888050fbe200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888050fbe280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888050fbe300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888050fbe380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================