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BUG: KASAN: use-after-free in ext4_xattr_set_entry+0x172/0x1ed6 fs/ext4/xattr.c:1593
Read of size 4 at addr ffffffe00d718004 by task syz-executor.1/11565

CPU: 1 PID: 11565 Comm: syz-executor.1 Not tainted 5.15.0-rc1-syzkaller-00001-g64a19591a293 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000957e>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:112

Allocated by task 2009:
(stack is not available)

The buggy address belongs to the object at ffffffe00d718000
 which belongs to the cache files_cache of size 832
The buggy address is located 4 bytes inside of
 832-byte region [ffffffe00d718000, ffffffe00d718340)
The buggy address belongs to the page:
page:ffffffcf02364600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffffe00d719e00 pfn:0x8d918
head:ffffffcf02364600 order:2 compound_mapcount:0 compound_pincount:0
memcg:ffffffe006987901
flags: 0xffe000000010200(slab|head|node=0|zone=0|lastcpupid=0x7ff)
raw: 0ffe000000010200 ffffffcf02208508 ffffffcf02364b08 ffffffe005636dc0
raw: ffffffe00d719e00 0000000000110007 00000001ffffffff ffffffe006987901
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 142, ts 53252388200, free_ts 53016675900
page_owner allocation stack trace missing
page_owner free stack trace missing

Memory state around the buggy address:
 ffffffe00d717f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffe00d717f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffe00d718000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffffffe00d718080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffffffe00d718100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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EXT4-fs error (device vda): ext4_xattr_set_entry:1596: inode #672: comm syz-executor.1: corrupted xattr entries