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BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2911
Read of size 4 at addr ffff888116ac8000 by task syz-executor/467

CPU: 0 PID: 467 Comm: syz-executor Not tainted 5.15.173-syzkaller-1077948-gb4bd207b0380 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2911
 ext4_evict_inode+0xea1/0x14e0 fs/ext4/inode.c:300
 evict+0x529/0x930 fs/inode.c:622
 iput_final fs/inode.c:1744 [inline]
 iput+0x63b/0x7e0 fs/inode.c:1770
 d_delete_notify include/linux/fsnotify.h:278 [inline]
 vfs_rmdir+0x359/0x470 fs/namei.c:4162
 do_rmdir+0x3ab/0x630 fs/namei.c:4210
 __do_sys_unlinkat fs/namei.c:4390 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4384
 x64_sys_call+0x6e9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f28b32445d7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcba25e2d8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f28b32445d7
RDX: 0000000000000200 RSI: 00007ffcba25f480 RDI: 00000000ffffff9c
RBP: 00007f28b32b7134 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffcba25f480
R13: 00007f28b32b7134 R14: 000000000000ca57 R15: 00007ffcba261630
 </TASK>

Allocated by task 453:
 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:433 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 kmem_cache_alloc_trace+0x11a/0x270 mm/slub.c:3269
 kmalloc include/linux/slab.h:603 [inline]
 get_mountpoint+0x212/0x450 fs/namespace.c:751
 attach_recursive_mnt+0x16d/0x1560 fs/namespace.c:2170
 graft_tree+0x15a/0x1b0 fs/namespace.c:2293
 do_loopback+0x3c7/0x520 fs/namespace.c:2408
 path_mount+0x571/0x1070 fs/namespace.c:3336
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3540
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3540
 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 453:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1723 [inline]
 slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749
 slab_free mm/slub.c:3521 [inline]
 kfree+0xcc/0x270 mm/slub.c:4583
 __put_mountpoint+0x1c7/0x220 fs/namespace.c:797
 put_mountpoint fs/namespace.c:804 [inline]
 attach_recursive_mnt+0x11cf/0x1560 fs/namespace.c:2220
 graft_tree+0x15a/0x1b0 fs/namespace.c:2293
 do_loopback+0x3c7/0x520 fs/namespace.c:2408
 path_mount+0x571/0x1070 fs/namespace.c:3336
 do_mount fs/namespace.c:3355 [inline]
 __do_sys_mount fs/namespace.c:3563 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3540
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3540
 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888116ac8000
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 0 bytes inside of
 64-byte region [ffff888116ac8000, ffff888116ac8040)
The buggy address belongs to the page:
page:ffffea00045ab200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116ac8
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 0000000000000000 0000000100000001 ffff888100042780
raw: 0000000000000000 0000000000200020 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 104, ts 5159259661, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5779
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 __kmalloc+0x172/0x2c0 mm/slub.c:4427
 __kmalloc_node include/linux/slab.h:469 [inline]
 kmalloc_node include/linux/slab.h:626 [inline]
 kvmalloc_node+0x1f0/0x4d0 mm/util.c:628
 kvmalloc include/linux/mm.h:851 [inline]
 simple_xattr_alloc+0x43/0xa0 fs/xattr.c:987
 shmem_initxattrs+0x8d/0x200 mm/shmem.c:3190
 security_inode_init_security+0x252/0x390 security/security.c:1115
 shmem_symlink+0x144/0x5f0 mm/shmem.c:3094
 vfs_symlink+0x29f/0x480 fs/namei.c:4429
 do_symlinkat+0x1ea/0x5a0 fs/namei.c:4458
 __do_sys_symlink fs/namei.c:4480 [inline]
 __se_sys_symlink fs/namei.c:4478 [inline]
 __x64_sys_symlink+0x7e/0x90 fs/namei.c:4478
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888116ac7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888116ac7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888116ac8000: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                   ^
 ffff888116ac8080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888116ac8100: 00 00 00 00 00 00 00 06 fc fc fc fc fc fc fc fc
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