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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 ffff88811289f018 by task syz.6.17/538

CPU: 1 PID: 538 Comm: syz.6.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 __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:420 [inline]
 listxattr+0x28f/0x300 fs/xattr.c:715
 path_listxattr+0xe1/0x1b0 fs/xattr.c:739
 __do_sys_listxattr fs/xattr.c:751 [inline]
 __se_sys_listxattr fs/xattr.c:748 [inline]
 __x64_sys_listxattr+0x80/0x90 fs/xattr.c:748
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9c563c2e59
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:00007f9c56224028 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2
RAX: ffffffffffffffda RBX: 00007f9c5664afa0 RCX: 00007f9c563c2e59
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f9c56458e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c5664b038 R14: 00007f9c5664afa0 R15: 00007fffe31ee918

Allocated by task 195:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965
 anon_vma_chain_alloc mm/rmap.c:138 [inline]
 anon_vma_fork+0x1ff/0x520 mm/rmap.c:360
 dup_mmap kernel/fork.c:567 [inline]
 dup_mm kernel/fork.c:1435 [inline]
 copy_mm+0x8f9/0x13d0 kernel/fork.c:1491
 copy_process+0x1386/0x3320 kernel/fork.c:2268
 kernel_clone+0x233/0x950 kernel/fork.c:2650
 __do_sys_clone kernel/fork.c:2776 [inline]
 __se_sys_clone kernel/fork.c:2760 [inline]
 __x64_sys_clone+0x198/0x210 kernel/fork.c:2760
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88811289f000
 which belongs to the cache anon_vma_chain of size 64
The buggy address is located 24 bytes inside of
 64-byte region [ffff88811289f000, ffff88811289f040)
The buggy address belongs to the page:
page:ffffea00044a27c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811289fc00 pfn:0x11289f
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea0004487f40 0000000700000007 ffff888100188300
raw: ffff88811289fc00 00000000802a0000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY), pid 195, ts 11524221594, free_ts 8306011134
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x1a4/0x2d0 mm/slub.c:2965
 anon_vma_chain_alloc mm/rmap.c:138 [inline]
 anon_vma_clone+0xb7/0x4c0 mm/rmap.c:284
 anon_vma_fork+0x8f/0x520 mm/rmap.c:347
 dup_mmap kernel/fork.c:567 [inline]
 dup_mm kernel/fork.c:1435 [inline]
 copy_mm+0x8f9/0x13d0 kernel/fork.c:1491
 copy_process+0x1386/0x3320 kernel/fork.c:2268
 kernel_clone+0x233/0x950 kernel/fork.c:2650
 __do_sys_clone kernel/fork.c:2776 [inline]
 __se_sys_clone kernel/fork.c:2760 [inline]
 __x64_sys_clone+0x198/0x210 kernel/fork.c:2760
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336
 free_unref_page mm/page_alloc.c:3391 [inline]
 free_the_page mm/page_alloc.c:5443 [inline]
 __free_pages+0x146/0x390 mm/page_alloc.c:5454
 free_pages+0x82/0x90 mm/page_alloc.c:5465
 tlb_batch_list_free mm/mmu_gather.c:61 [inline]
 tlb_finish_mmu+0x258/0x310 mm/mmu_gather.c:329
 exit_mmap+0x329/0x590 mm/mmap.c:3387
 __mmput+0x92/0x2d0 kernel/fork.c:1153
 mmput+0x4e/0x150 kernel/fork.c:1176
 exit_mm kernel/exit.c:546 [inline]
 do_exit+0x9d8/0x24e0 kernel/exit.c:866
 do_group_exit+0x149/0x310 kernel/exit.c:993
 __do_sys_exit_group kernel/exit.c:1004 [inline]
 __se_sys_exit_group kernel/exit.c:1002 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1002
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88811289ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811289ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811289f000: fb fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
                            ^
 ffff88811289f080: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb
 ffff88811289f100: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc
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