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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+0x4a6/0xc50 fs/ext4/xattr.c:765
Read of size 4 at addr ffff88812cf66090 by task syz.6.22/431

CPU: 1 PID: 431 Comm: syz.6.22 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+0xe2/0x130 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+0x4a6/0xc50 fs/ext4/xattr.c:765
 vfs_listxattr fs/xattr.c:420 [inline]
 listxattr+0x294/0x300 fs/xattr.c:715
 path_listxattr+0xe1/0x1b0 fs/xattr.c:739
 __do_sys_llistxattr fs/xattr.c:757 [inline]
 __se_sys_llistxattr fs/xattr.c:754 [inline]
 __x64_sys_llistxattr+0x7d/0x90 fs/xattr.c:754
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fb406978e59
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:00007ffd3a6c56e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3
RAX: ffffffffffffffda RBX: 00007fb406bf1fa0 RCX: 00007fb406978e59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000400
RBP: 00007fb406a0ed6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb406bf1fac R14: 00007fb406bf1fa0 R15: 00007fb406bf1fa0

The buggy address belongs to the page:
page:ffffea0004b3d980 refcount:1 mapcount:1 mapping:0000000000000000 index:0x7fffffffd pfn:0x12cf66
anon flags: 0x4000000000080014(uptodate|lru|swapbacked)
raw: 4000000000080014 ffffea000498d588 ffffea000498c5c8 ffff88810d7c9679
raw: 00000007fffffffd 0000000000000000 0000000100000000 ffff888100142000
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff888100142000
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x100cca(GFP_HIGHUSER_MOVABLE), pid 94, ts 43003779711, free_ts 42994951228
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x179/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5384
 __alloc_pages include/linux/gfp.h:544 [inline]
 __alloc_pages_node include/linux/gfp.h:557 [inline]
 alloc_pages_node include/linux/gfp.h:571 [inline]
 alloc_pages include/linux/gfp.h:590 [inline]
 wp_page_copy+0x212/0x15f0 mm/memory.c:3171
 do_wp_page+0x9a6/0xc80 mm/memory.c:-1
 handle_pte_fault+0xb47/0x37d0 mm/memory.c:4819
 __handle_mm_fault mm/memory.c:4953 [inline]
 handle_mm_fault+0xf81/0x1710 mm/memory.c:5367
 do_user_addr_fault+0x5a1/0xde0 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1436 [inline]
 exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1492
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
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_list+0x129/0x9c0 mm/page_alloc.c:3443
 release_pages+0xe52/0xea0 mm/swap.c:1103
 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x17e/0x310 mm/mmu_gather.c:326
 unmap_region+0x355/0x3c0 mm/mmap.c:2811
 __do_munmap+0x63c/0x850 mm/mmap.c:3041
 __vm_munmap mm/mmap.c:3094 [inline]
 __do_sys_munmap mm/mmap.c:3120 [inline]
 __se_sys_munmap+0x130/0x1c0 mm/mmap.c:3116
 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3116
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88812cf65f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812cf66000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88812cf66080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                         ^
 ffff88812cf66100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88812cf66180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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