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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0xfe8/0x15c0 fs/ext4/xattr.c:1735
Read of size 7168 at addr ffff0000fbfe4800 by task syz.0.121/7110

CPU: 0 UID: 0 PID: 7110 Comm: syz.0.121 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
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+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:200
 __asan_memmove+0x3c/0x84 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0xfe8/0x15c0 fs/ext4/xattr.c:1735
 ext4_xattr_block_set+0x1758/0x24bc fs/ext4/xattr.c:1956
 ext4_xattr_set_handle+0xde8/0x1260 fs/ext4/xattr.c:2452
 ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2554
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200
 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295
 vfs_setxattr+0x158/0x2ac fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x20c/0x4f8 fs/xattr.c:665
 path_setxattrat+0x2e8/0x320 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __arm64_sys_lsetxattr+0xc0/0xdc fs/xattr.c:750
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the physical page:
page: refcount:2 mapcount:0 mapping:00000000597052bf index:0x1c pfn:0x13bfe4
memcg:ffff0000c19c1900
aops:def_blk_aops ino:700000 dentry name(?):""
flags: 0x5ffc00000004134(referenced|dirty|lru|active|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000004134 fffffdffc35bd648 fffffdffc3652388 ffff0000c1564210
raw: 000000000000001c ffff0000c15d6000 00000002ffffffff ffff0000c19c1900
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000fbfe4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000fbfe4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000fbfe5000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff0000fbfe5080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000fbfe5100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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