netlink: 24 bytes leftover after parsing attributes in process `syz-executor.2'.
==================================================================
BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543
Read of size 1 at addr ffff88817f418444 by task syz-executor.2/31607

CPU: 0 PID: 31607 Comm: syz-executor.2 Tainted: G        W          6.1.75-syzkaller-00026-g68c821783c76 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0x158/0x4e0 mm/kasan/report.c:427
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348
 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543
 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1722
 __ext4_find_entry+0x2b0/0x1af0 fs/ext4/namei.c:1616
 ext4_lookup_entry fs/ext4/namei.c:1771 [inline]
 ext4_lookup+0x176/0x740 fs/ext4/namei.c:1839
 lookup_open fs/namei.c:3467 [inline]
 open_last_lookups fs/namei.c:3557 [inline]
 path_openat+0x10fd/0x2d60 fs/namei.c:3787
 do_filp_open+0x230/0x480 fs/namei.c:3817
 do_sys_openat2+0x13f/0x850 fs/open.c:1341
 do_sys_open fs/open.c:1357 [inline]
 __do_sys_open fs/open.c:1365 [inline]
 __se_sys_open fs/open.c:1361 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1361
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbaa5c7cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbaa6ad00c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fbaa5dabf80 RCX: 00007fbaa5c7cee9
RDX: 0000000000000100 RSI: 0000000000101000 RDI: 0000000020000400
RBP: 00007fbaa5cc949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fbaa5dabf80 R15: 00007ffef840e098
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0005fd0600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x17f418
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea0005fd0648 ffffea0004f3edc8 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 31527, tgid 31526 (syz-executor.0), ts 1618922479558, free_ts 1619766543780
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425
 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5712
 __folio_alloc+0x15/0x40 mm/page_alloc.c:5744
 __folio_alloc_node include/linux/gfp.h:245 [inline]
 folio_alloc include/linux/gfp.h:274 [inline]
 shmem_alloc_folio mm/shmem.c:1597 [inline]
 shmem_alloc_and_acct_folio+0x78c/0xa50 mm/shmem.c:1622
 shmem_get_folio_gfp+0x12d4/0x24b0 mm/shmem.c:1950
 shmem_fault+0x1f7/0x840 mm/shmem.c:2165
 __do_fault mm/memory.c:4309 [inline]
 do_read_fault mm/memory.c:4668 [inline]
 do_fault+0xdb6/0x1cd0 mm/memory.c:4804
 handle_pte_fault mm/memory.c:5101 [inline]
 __handle_mm_fault mm/memory.c:5243 [inline]
 handle_mm_fault+0x184a/0x2f40 mm/memory.c:5383
 faultin_page mm/gup.c:1009 [inline]
 __get_user_pages+0x377/0xf20 mm/gup.c:1233
 populate_vma_page_range mm/gup.c:1590 [inline]
 __mm_populate+0x375/0x570 mm/gup.c:1704
 mm_populate include/linux/mm.h:3052 [inline]
 vm_mmap_pgoff+0x290/0x430 mm/util.c:530
 ksys_mmap_pgoff+0xed/0x1e0 mm/mmap.c:1521
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1498 [inline]
 free_pcp_prepare mm/page_alloc.c:1572 [inline]
 free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498
 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3646
 release_pages+0xf7f/0xfe0 mm/swap.c:1063
 __pagevec_release+0x84/0x100 mm/swap.c:1083
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 shmem_undo_range+0x5fc/0x1660 mm/shmem.c:951
 shmem_truncate_range mm/shmem.c:1067 [inline]
 shmem_evict_inode+0x25f/0xa30 mm/shmem.c:1176
 evict+0x2a3/0x630 fs/inode.c:666
 iput_final fs/inode.c:1791 [inline]
 iput+0x642/0x870 fs/inode.c:1817
 dentry_unlink_inode+0x34f/0x440 fs/dcache.c:401
 __dentry_kill+0x447/0x650 fs/dcache.c:607
 dentry_kill+0xc0/0x2a0
 dput+0x160/0x310 fs/dcache.c:913
 __fput+0x5f0/0x870 fs/file_table.c:328
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x24d/0x2e0 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xbd5/0x2b80 kernel/exit.c:875

Memory state around the buggy address:
 ffff88817f418300: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817f418380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88817f418400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                           ^
 ffff88817f418480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88817f418500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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