================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1326/0x3860 fs/ext4/xattr.c:1729 Read of size 18446744073709551600 at addr ffff88812e2342b8 by task syz.7.458/2127 CPU: 0 PID: 2127 Comm: syz.7.458 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 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+0x1326/0x3860 fs/ext4/xattr.c:1729 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2229 ext4_destroy_inline_data_nolock+0x20f/0x5e0 fs/ext4/inline.c:464 ext4_convert_inline_data_to_extent fs/ext4/inline.c:629 [inline] ext4_try_to_write_inline_data+0x6d0/0x11f0 fs/ext4/inline.c:769 ext4_write_begin+0x246/0x1690 fs/ext4/inode.c:1192 ext4_da_write_begin+0x478/0xf10 fs/ext4/inode.c:3033 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x758/0xdc0 fs/read_write.c:605 ksys_pwrite64 fs/read_write.c:712 [inline] __do_sys_pwrite64 fs/read_write.c:722 [inline] __se_sys_pwrite64 fs/read_write.c:719 [inline] __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:719 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa87decd799 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:00007fa87c928028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fa87e146fa0 RCX: 00007fa87decd799 RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000008 RBP: 00007fa87df63c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa87e147038 R14: 00007fa87e146fa0 R15: 00007fffbbfd6bc8 The buggy address belongs to the page: page:ffffea0004b88d00 refcount:3 mapcount:1 mapping:ffff88811074f150 index:0x2 pfn:0x12e234 aops:def_blk_aops ino:0 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk) raw: 400000000002203e ffffea0004732ec8 ffff88812f396030 ffff88811074f150 raw: 0000000000000002 ffff88812aefb2a0 0000000300000000 ffff88811c448000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88811c448000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 2127, ts 97719803107, free_ts 97710102738 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x63e/0x930 mm/filemap.c:1848 find_or_create_page include/linux/pagemap.h:402 [inline] grow_dev_page fs/buffer.c:976 [inline] grow_buffers fs/buffer.c:1045 [inline] __getblk_slow fs/buffer.c:1072 [inline] __getblk_gfp+0x212/0x780 fs/buffer.c:1370 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x467/0xc30 fs/ext4/inode.c:4449 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4559 [inline] __ext4_iget+0x495/0x44c0 fs/ext4/inode.c:4809 ext4_lookup+0x43c/0x8d0 fs/ext4/namei.c:1830 lookup_open fs/namei.c:3234 [inline] open_last_lookups fs/namei.c:3325 [inline] path_openat+0x1140/0x31c0 fs/namei.c:3514 do_filp_open+0x1e2/0x410 fs/namei.c:3544 do_sys_openat2+0x19f/0x750 fs/open.c:1219 do_sys_open fs/open.c:1235 [inline] __do_sys_openat fs/open.c:1251 [inline] __se_sys_openat fs/open.c:1246 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1246 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x129/0x9c0 mm/page_alloc.c:3443 release_pages+0xe52/0xea0 mm/swap.c:1103 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] shmem_undo_range+0x74a/0x1810 mm/shmem.c:969 shmem_truncate_range mm/shmem.c:1073 [inline] shmem_evict_inode+0x210/0xa00 mm/shmem.c:1173 evict+0x4ae/0x930 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378 __dentry_kill+0x44f/0x650 fs/dcache.c:583 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:883 __fput+0x4fe/0x770 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa90/0x2500 kernel/exit.c:872 Memory state around the buggy address: ffff88812e234180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812e234200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88812e234280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88812e234300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812e234380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop7): ext4_xattr_set_entry:1742: inode #15: comm syz.7.458: unable to update i_inline_off