================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x13ba/0x3940 fs/ext4/xattr.c:1736 Read of size 18446744073709551600 at addr ffff8881328e12b8 by task syz.3.472/2188 CPU: 0 PID: 2188 Comm: syz.3.472 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 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+0x13ba/0x3940 fs/ext4/xattr.c:1736 ext4_xattr_ibody_set+0x122/0x360 fs/ext4/xattr.c:2238 ext4_destroy_inline_data_nolock+0x234/0x5d0 fs/ext4/inline.c:468 ext4_convert_inline_data_nolock+0x3af/0xcd0 fs/ext4/inline.c:1271 ext4_convert_inline_data+0x4b9/0x5f0 fs/ext4/inline.c:2112 ext4_fallocate+0xfd/0x1de0 fs/ext4/extents.c:4759 vfs_fallocate+0x4b4/0x590 fs/open.c:309 ksys_fallocate fs/open.c:332 [inline] __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:338 x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5ed4a63629 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:00007f5ed34be028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f5ed4cdcfa0 RCX: 00007f5ed4a63629 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f5ed4af9b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5ed4cdd038 R14: 00007f5ed4cdcfa0 R15: 00007ffdcb90e7f8 The buggy address belongs to the page: page:ffffea0004ca3840 refcount:2 mapcount:0 mapping:ffff88810930f258 index:0x2 pfn:0x1328e1 memcg:ffff88810dca4500 aops:def_blk_aops ino:700003 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea0004676d48 ffffea0004b75008 ffff88810930f258 raw: 0000000000000002 ffff88813b4ec540 00000002ffffffff ffff88810dca4500 page dumped because: kasan: bad access detected 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 2188, ts 123296243648, free_ts 122403209506 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5808 __alloc_pages_node include/linux/gfp.h:595 [inline] alloc_pages_node include/linux/gfp.h:609 [inline] alloc_pages include/linux/gfp.h:622 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xac6/0xde0 mm/filemap.c:1955 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x238/0x7d0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x46e/0xcd0 fs/ext4/inode.c:4363 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4471 [inline] __ext4_iget+0x448/0x3e50 fs/ext4/inode.c:4726 ext4_lookup+0x4b4/0x960 fs/ext4/namei.c:1858 lookup_open fs/namei.c:3448 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0xfc9/0x2f20 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x15e/0x7f0 fs/open.c:1236 do_sys_open fs/open.c:1252 [inline] __do_sys_open fs/open.c:1260 [inline] __se_sys_open fs/open.c:1256 [inline] __x64_sys_open+0x11c/0x140 fs/open.c:1256 x64_sys_call+0x3fc/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:3 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page_list+0x13a/0x9d0 mm/page_alloc.c:3671 release_pages+0x1006/0x1060 mm/swap.c:1015 __pagevec_release+0x71/0xe0 mm/swap.c:1035 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x595/0x1470 mm/shmem.c:969 shmem_truncate_range mm/shmem.c:1068 [inline] shmem_evict_inode+0x21a/0xa10 mm/shmem.c:1150 evict+0x4c9/0x8d0 fs/inode.c:650 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 dentry_unlink_inode+0x32f/0x3e0 fs/dcache.c:380 __dentry_kill+0x44f/0x650 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x47/0x90 fs/dcache.c:893 __fput+0x580/0x8b0 fs/file_table.c:319 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa9e/0x27e0 kernel/exit.c:889 Memory state around the buggy address: ffff8881328e1180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881328e1200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881328e1280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881328e1300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881328e1380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop3): ext4_validate_block_bitmap:438: comm syz.3.472: bg 0: block 7168: padding at end of block bitmap is not set