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BUG: KASAN: use-after-free in ext4_xattr_list_entries+0x302/0x3d0 fs/ext4/xattr.c:724
Read of size 4 at addr ffff88804d4ff014 by task syz.0.0/5327

CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 ext4_xattr_list_entries+0x302/0x3d0 fs/ext4/xattr.c:724
 ext4_xattr_ibody_list fs/ext4/xattr.c:793 [inline]
 ext4_listxattr+0x229/0x680 fs/ext4/xattr.c:818
 vfs_listxattr fs/xattr.c:516 [inline]
 listxattr+0x19d/0x380 fs/xattr.c:941
 filename_listxattr fs/xattr.c:974 [inline]
 path_listxattrat+0x1a3/0x3f0 fs/xattr.c:1001
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f368339de99
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:00007f368418bfe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3
RAX: ffffffffffffffda RBX: 00007f3683626090 RCX: 00007f368339de99
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f3683433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3683626128 R14: 00007f3683626090 R15: 00007ffe9a973d28
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f3677201 pfn:0x4d4ff
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000000 ffffea0001354008 ffffea000135e4c8 0000000000000000
raw: 00000007f3677201 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 5327, tgid 5325 (syz.0.0), ts 95195106716, free_ts 95196292522
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
 alloc_pages_mpol+0x212/0x380 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x39/0x160 mm/mempolicy.c:2509
 vma_alloc_folio_noprof+0xe1/0x1e0 mm/mempolicy.c:2544
 folio_prealloc mm/memory.c:-1 [inline]
 wp_page_copy mm/memory.c:3875 [inline]
 do_wp_page+0x1163/0x4c70 mm/memory.c:4336
 handle_pte_fault mm/memory.c:6395 [inline]
 __handle_mm_fault mm/memory.c:6517 [inline]
 handle_mm_fault+0x1490/0x3080 mm/memory.c:6686
 do_user_addr_fault+0xa4d/0x1340 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
page last free pid 5327 tgid 5325 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xd84/0x14a0 mm/page_alloc.c:3011
 folio_batch_move_lru+0x877/0xa60 mm/swap.c:211
 lru_add_drain_cpu+0xbc/0x750 mm/swap.c:699
 lru_add_drain+0x121/0x3e0 mm/swap.c:788
 __folio_batch_release+0x48/0x90 mm/swap.c:1114
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x4e6/0x15d0 mm/shmem.c:1149
 shmem_truncate_range mm/shmem.c:1277 [inline]
 shmem_evict_inode+0x280/0xa80 mm/shmem.c:1407
 evict+0x624/0xb50 fs/inode.c:825
 dentry_kill+0x1b9/0x880 fs/dcache.c:826
 finish_dput+0x1a/0x260 fs/dcache.c:1001
 __fput+0x675/0xa50 fs/file_table.c:520
 fput_close_sync+0x11f/0x240 fs/file_table.c:617
 __do_sys_close fs/open.c:1511 [inline]
 __se_sys_close fs/open.c:1496 [inline]
 __x64_sys_close+0x7e/0x110 fs/open.c:1496
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88804d4fef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804d4fef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804d4ff000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff88804d4ff080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804d4ff100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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