EXT4-fs (loop6): mounted filesystem without journal. Opts: block_validity,bsddf,noacl,norecovery,debug_want_extra_isize=0x0000000000000080,orlov,nogrpid,noauto_da_alloc,norecovery,,errors=continue. Quota mode: none.
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BUG: KASAN: use-after-free in ext4_xattr_list_entries fs/ext4/xattr.c:670 [inline]
BUG: KASAN: use-after-free in ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline]
BUG: KASAN: use-after-free in ext4_listxattr+0x4a9/0xc60 fs/ext4/xattr.c:765
Read of size 4 at addr ffff88812a504090 by task syz.6.17/396

CPU: 0 PID: 396 Comm: syz.6.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __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
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_list_entries fs/ext4/xattr.c:670 [inline]
 ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline]
 ext4_listxattr+0x4a9/0xc60 fs/ext4/xattr.c:765
 vfs_listxattr fs/xattr.c:448 [inline]
 listxattr+0x28f/0x300 fs/xattr.c:783
 path_listxattr+0xe1/0x1b0 fs/xattr.c:807
 __do_sys_llistxattr fs/xattr.c:825 [inline]
 __se_sys_llistxattr fs/xattr.c:822 [inline]
 __x64_sys_llistxattr+0x7d/0x90 fs/xattr.c:822
 x64_sys_call+0x584/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:196
 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: 0033:0x7f44e3e50e59
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:00007ffcaf582a58 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3
RAX: ffffffffffffffda RBX: 00007f44e40d8fa0 RCX: 00007f44e3e50e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000400
RBP: 00007f44e3ee6e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f44e40d8fac R14: 00007f44e40d8fa0 R15: 00007f44e40d8fa0
 </TASK>

The buggy address belongs to the page:
page:ffffea0004a94100 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12a504
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea0004a93d48 ffff8881f713c580 0000000000000000
raw: 0000000000000001 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 320, ts 38241501963, free_ts 38242944323
 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]
 shmem_alloc_page mm/shmem.c:1587 [inline]
 shmem_alloc_and_acct_page+0x4a2/0x8d0 mm/shmem.c:1612
 shmem_getpage_gfp+0x127d/0x2250 mm/shmem.c:1908
 shmem_getpage mm/shmem.c:152 [inline]
 shmem_write_begin+0xce/0x1b0 mm/shmem.c:2476
 generic_perform_write+0x2b7/0x690 mm/filemap.c:3887
 __generic_file_write_iter+0x268/0x490 mm/filemap.c:4015
 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:4047
 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_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 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
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_list+0x138/0x9e0 mm/page_alloc.c:3673
 release_pages+0x1264/0x12c0 mm/swap.c:1015
 __pagevec_release+0x71/0xe0 mm/swap.c:1035
 pagevec_release include/linux/pagevec.h:81 [inline]
 shmem_undo_range+0x564/0x13b0 mm/shmem.c:965
 shmem_truncate_range mm/shmem.c:1064 [inline]
 shmem_evict_inode+0x1dc/0x970 mm/shmem.c:1146
 evict+0x4b6/0x8b0 fs/inode.c:650
 iput_final fs/inode.c:1779 [inline]
 iput+0x651/0x7e0 fs/inode.c:1805
 dentry_unlink_inode+0x338/0x3e0 fs/dcache.c:380
 __dentry_kill+0x45b/0x660 fs/dcache.c:586
 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1
 dput+0x47/0x90 fs/dcache.c:893
 do_renameat2+0xa33/0xfc0 fs/namei.c:4995
 __do_sys_rename fs/namei.c:5039 [inline]
 __se_sys_rename fs/namei.c:5037 [inline]
 __x64_sys_rename+0x86/0x90 fs/namei.c:5037
 x64_sys_call+0x680/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:83
 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:
 ffff88812a503f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812a504000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88812a504080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff88812a504100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88812a504180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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