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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x86c/0x164c fs/ext4/xattr.c:1767
Read of size 18446744073709551600 at addr ffff0000f4aaa6b8 by task syz.1.779/8267

CPU: 1 UID: 0 PID: 8267 Comm: syz.1.779 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x17c/0x1ac mm/kasan/generic.c:200
 __asan_memmove+0x3c/0x84 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x86c/0x164c fs/ext4/xattr.c:1767
 ext4_xattr_ibody_set+0x20c/0x4b4 fs/ext4/xattr.c:2277
 ext4_destroy_inline_data_nolock+0x1c8/0x4a8 fs/ext4/inline.c:471
 ext4_convert_inline_data_to_extent+0x424/0xc34 fs/ext4/inline.c:630
 ext4_try_to_write_inline_data+0x68/0xa8 fs/ext4/inline.c:788
 ext4_write_begin+0x314/0x14bc fs/ext4/inode.c:1306
 generic_perform_write+0x23c/0x7a4 mm/filemap.c:4374
 ext4_buffered_write_iter+0xd8/0x2f4 fs/ext4/file.c:354
 ext4_file_write_iter+0x1f4/0x1478 fs/ext4/file.c:-1
 do_iter_readv_writev+0x48c/0x6f8 fs/read_write.c:-1
 vfs_writev+0x2a8/0x630 fs/read_write.c:1058
 do_pwritev+0x11c/0x224 fs/read_write.c:1154
 __do_sys_pwritev2 fs/read_write.c:1212 [inline]
 __se_sys_pwritev2 fs/read_write.c:1203 [inline]
 __arm64_sys_pwritev2+0xe4/0x118 fs/read_write.c:1203
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:00000000beb35774 index:0xc pfn:0x134aaa
memcg:ffff0000d36edf80
aops:def_blk_aops ino:700001 dentry name(?):""
flags: 0x5ffc00000004134(referenced|dirty|lru|active|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000004134 fffffdffc47d13c8 fffffdffc3728ec8 ffff0000c154e4d0
raw: 000000000000000c ffff0000daf93540 00000002ffffffff ffff0000d36edf80
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f4aaa580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f4aaa600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f4aaa680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                        ^
 ffff0000f4aaa700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f4aaa780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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