================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xb02/0x2230 fs/ext4/xattr.c:1710 Read of size 18446744073709551600 at addr ffff888140f495e8 by task syz.9.792/3993 CPU: 1 PID: 3993 Comm: syz.9.792 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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:1710 ext4_xattr_ibody_set+0x25b/0x720 fs/ext4/xattr.c:2217 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: 0033:0x7fe42cf9e159 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:00007fe42de57028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe42d225fa0 RCX: 00007fe42cf9e159 RDX: 0000000000001006 RSI: 0000200000002980 RDI: 0000000000000007 RBP: 00007fe42d03503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe42d226038 R14: 00007fe42d225fa0 R15: 00007ffd9cd7d448 The buggy address belongs to the physical page: page:ffffea000503d240 refcount:3 mapcount:0 mapping:ffff88810048c1d0 index:0x2 pfn:0x140f49 memcg:ffff888100239d40 aops:def_blk_aops ino:700009 flags: 0x460000000000204a(referenced|dirty|workingset|private|zone=1) raw: 460000000000204a 0000000000000000 dead000000000122 ffff88810048c1d0 raw: 0000000000000002 ffff88813b244498 00000003ffffffff ffff888100239d40 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 3993, tgid 3992 (syz.9.792), ts 158419341457, free_ts 158407110411 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931 __folio_alloc+0x12/0x40 mm/page_alloc.c:5964 __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_dirty_inode+0xbd/0x100 fs/ext4/inode.c:6158 __mark_inode_dirty+0x1fd/0x9c0 fs/fs-writeback.c:2455 generic_update_time fs/inode.c:1957 [inline] inode_update_time fs/inode.c:1970 [inline] __file_update_time+0x245/0x270 fs/inode.c:2158 file_modified_flags+0x390/0x440 fs/inode.c:2231 file_modified+0x17/0x20 fs/inode.c:2247 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1581 [inline] free_pcp_prepare mm/page_alloc.c:1655 [inline] free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622 free_unref_page_list+0x117/0x8d0 mm/page_alloc.c:3773 release_pages+0xc7e/0xce0 mm/swap.c:1053 __pagevec_release+0x71/0xe0 mm/swap.c:1073 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x564/0x14e0 mm/shmem.c:951 shmem_truncate_range mm/shmem.c:1067 [inline] shmem_evict_inode+0x21f/0x9c0 mm/shmem.c:1176 evict+0x4c4/0x8c0 fs/inode.c:709 iput_final fs/inode.c:1845 [inline] iput+0x633/0x690 fs/inode.c:1871 dentry_unlink_inode+0x346/0x3f0 fs/dcache.c:405 __dentry_kill+0x46c/0x680 fs/dcache.c:611 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:918 __fput+0x5c0/0x8f0 fs/file_table.c:328 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x1e1/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177 Memory state around the buggy address: ffff888140f49480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888140f49500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888140f49580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888140f49600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888140f49680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== syz.9.792: attempt to access beyond end of device loop9: rw=2049, sector=74, nr_sectors = 8 limit=64 EXT4-fs warning (device loop9): ext4_end_bio:347: I/O error 10 writing to inode 18 starting block 37) Buffer I/O error on device loop9, logical block 37 Buffer I/O error on device loop9, logical block 38 Buffer I/O error on device loop9, logical block 39 Buffer I/O error on device loop9, logical block 40 syz.9.792: attempt to access beyond end of device loop9: rw=2049, sector=82, nr_sectors = 2 limit=64 EXT4-fs warning (device loop9): ext4_end_bio:347: I/O error 10 writing to inode 18 starting block 41) Buffer I/O error on device loop9, logical block 41 EXT4-fs (loop9): unmounting filesystem.