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BUG: KASAN: use-after-free in ext4_xattr_list_entries+0x278/0x334 fs/ext4/xattr.c:670
Read of size 4 at addr ffff0000ce6cf028 by task syz.8.509/6698

CPU: 1 PID: 6698 Comm: syz.8.509 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 ext4_xattr_list_entries+0x278/0x334 fs/ext4/xattr.c:670
 ext4_xattr_ibody_list fs/ext4/xattr.c:740 [inline]
 ext4_listxattr+0x1a8/0x4e8 fs/ext4/xattr.c:765
 vfs_listxattr fs/xattr.c:457 [inline]
 listxattr+0x29c/0x3cc fs/xattr.c:804
 path_listxattr+0xe0/0x1b8 fs/xattr.c:828
 __do_sys_listxattr fs/xattr.c:840 [inline]
 __se_sys_listxattr fs/xattr.c:837 [inline]
 __arm64_sys_listxattr+0x80/0x94 fs/xattr.c:837
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 3990:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x430 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x22c/0x308 mm/slub.c:3383
 vm_area_dup+0x30/0x1c4 kernel/fork.c:467
 dup_mmap kernel/fork.c:646 [inline]
 dup_mm kernel/fork.c:1546 [inline]
 copy_mm+0x824/0x11ec kernel/fork.c:1595
 copy_process+0x18f8/0x36e4 kernel/fork.c:2356
 kernel_clone+0x1ec/0x918 kernel/fork.c:2762
 __do_sys_clone kernel/fork.c:2903 [inline]
 __se_sys_clone kernel/fork.c:2871 [inline]
 __arm64_sys_clone+0x154/0x1c0 kernel/fork.c:2871
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 6576:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 kmem_cache_free+0x118/0x314 mm/slub.c:3709
 vm_area_free+0x58/0x128 kernel/fork.c:486
 remove_vma mm/mmap.c:144 [inline]
 remove_mt mm/mmap.c:2319 [inline]
 do_mas_align_munmap+0xc6c/0xf38 mm/mmap.c:2595
 do_mas_munmap mm/mmap.c:2650 [inline]
 __vm_munmap+0x25c/0x38c mm/mmap.c:2936
 __do_sys_munmap mm/mmap.c:2961 [inline]
 __se_sys_munmap mm/mmap.c:2958 [inline]
 __arm64_sys_munmap+0x64/0x7c mm/mmap.c:2958
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000ce6cf000
 which belongs to the cache vm_area_struct of size 152
The buggy address is located 40 bytes inside of
 152-byte region [ffff0000ce6cf000, ffff0000ce6cf098)

The buggy address belongs to the physical page:
page:00000000647ad442 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e6cf
memcg:ffff0000de08dc01
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 fffffc0003bf6c40 dead000000000006 ffff0000c03db680
raw: 0000000000000000 0000000000120012 00000001ffffffff ffff0000de08dc01
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ce6cef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000ce6cef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000ce6cf000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff0000ce6cf080: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb
 ffff0000ce6cf100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
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