================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x11db/0x3a80 fs/ext4/xattr.c:1738 Read of size 18446744073709551600 at addr ffff8881344ec2b8 by task syz.2.30/459 CPU: 0 PID: 459 Comm: syz.2.30 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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+0x10f/0x150 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+0x11db/0x3a80 fs/ext4/xattr.c:1738 ext4_xattr_ibody_set+0x114/0x330 fs/ext4/xattr.c:2240 ext4_destroy_inline_data_nolock+0x234/0x5e0 fs/ext4/inline.c:468 ext4_convert_inline_data_to_extent fs/ext4/inline.c:641 [inline] ext4_try_to_write_inline_data+0x6f4/0x11a0 fs/ext4/inline.c:782 ext4_write_begin+0x26a/0x1360 fs/ext4/inode.c:1194 generic_perform_write+0x2b7/0x690 mm/filemap.c:3887 ext4_buffered_write_iter+0x4ab/0x630 fs/ext4/file.c:270 ext4_file_write_iter+0x427/0x1530 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_pwrite64 fs/read_write.c:701 [inline] __do_sys_pwrite64 fs/read_write.c:711 [inline] __se_sys_pwrite64 fs/read_write.c:708 [inline] __x64_sys_pwrite64+0x194/0x220 fs/read_write.c:708 x64_sys_call+0xa6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19 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: 0033:0x7f9e430d40d9 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:00007f9e41b2d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f9e4335bfa0 RCX: 00007f9e430d40d9 RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000007 RBP: 00007f9e4316b024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008000c61 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9e4335c038 R14: 00007f9e4335bfa0 R15: 00007ffca964b1b8 The buggy address belongs to the page: page:ffffea0004d13b00 refcount:3 mapcount:1 mapping:ffff888109309d18 index:0x2 pfn:0x1344ec memcg:ffff888100250000 aops:def_blk_aops ino:700002 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea0004c1ff48 ffff888100259130 ffff888109309d18 raw: 0000000000000002 ffff88810d16fd20 0000000300000000 ffff888100250000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x108c40(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL), pid 459, ts 30728344909, free_ts 30728064787 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 __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+0xacc/0xdd0 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+0x231/0x7d0 fs/buffer.c:1336 sb_getblk_gfp include/linux/buffer_head.h:368 [inline] ext4_sb_breadahead_unmovable+0x6b/0xe0 fs/ext4/super.c:238 __ext4_get_inode_loc+0x98d/0xcb0 fs/ext4/inode.c:4448 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4478 [inline] __ext4_iget+0x448/0x3e80 fs/ext4/inode.c:4733 ext4_fill_super+0x6b8f/0x8bf0 fs/ext4/super.c:4863 mount_bdev+0x28d/0x3c0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6650 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x251/0xb40 fs/namespace.c:3037 path_mount+0x640/0xff0 fs/namespace.c:3367 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 free_pages+0x82/0x90 mm/page_alloc.c:5911 ext4_calculate_overhead+0x10c7/0x12a0 fs/ext4/super.c:3825 ext4_fill_super+0x6aad/0x8bf0 fs/ext4/super.c:4841 mount_bdev+0x28d/0x3c0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6650 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x251/0xb40 fs/namespace.c:3037 path_mount+0x640/0xff0 fs/namespace.c:3367 do_mount fs/namespace.c:3380 [inline] __do_sys_mount fs/namespace.c:3588 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3565 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff8881344ec180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881344ec200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881344ec280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881344ec300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881344ec380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs warning (device loop2): ext4_xattr_set_entry:1751: inode #15: comm syz.2.30: unable to update i_inline_off