==================================================================
BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline]
BUG: KASAN: use-after-free in ext4_convert_inline_data_nolock+0x311/0xa70 fs/ext4/inline.c:1216
Read of size 68 at addr ffff8881251f70cf by task syz-executor.4/388

CPU: 0 PID: 388 Comm: syz-executor.4 Not tainted 6.1.112-syzkaller-1151952-g38859a233e31 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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
 kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189
 memcpy+0x2d/0x70 mm/kasan/shadow.c:65
 ext4_read_inline_data fs/ext4/inline.c:210 [inline]
 ext4_convert_inline_data_nolock+0x311/0xa70 fs/ext4/inline.c:1216
 ext4_try_add_inline_entry+0x7ff/0xb60 fs/ext4/inline.c:1342
 ext4_add_entry+0x5e4/0xed0 fs/ext4/namei.c:2456
 ext4_mkdir+0x54f/0xce0 fs/ext4/namei.c:3079
 vfs_mkdir+0x398/0x570 fs/namei.c:4107
 do_mkdirat+0x1eb/0x450 fs/namei.c:4132
 __do_sys_mkdirat fs/namei.c:4147 [inline]
 __se_sys_mkdirat fs/namei.c:4145 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4145
 x64_sys_call+0x6c6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5c2587c9a7
Code: 73 01 c3 48 c7 c1 b0 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 02 01 00 00 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:00007f5c26562ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f5c26562f80 RCX: 00007f5c2587c9a7
RDX: 00000000000001ff RSI: 0000000020000580 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000580
R13: 00007f5c26562f40 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0004947dc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1251f7
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea0004947e08 ffff8881f713c768 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 0x8140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO|__GFP_CMA), pid 388, tgid 387 (syz-executor.4), ts 48321957191, free_ts 48323261271
 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+0x2980/0x2a10 mm/page_alloc.c:4439
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5728
 __folio_alloc+0x15/0x40 mm/page_alloc.c:5760
 __folio_alloc_node include/linux/gfp.h:245 [inline]
 folio_alloc include/linux/gfp.h:274 [inline]
 alloc_page_vma include/linux/gfp.h:283 [inline]
 do_anonymous_page mm/memory.c:4269 [inline]
 handle_pte_fault mm/memory.c:5155 [inline]
 __handle_mm_fault mm/memory.c:5299 [inline]
 handle_mm_fault+0x1cf7/0x30e0 mm/memory.c:5439
 do_user_addr_fault arch/x86/mm/fault.c:1323 [inline]
 handle_page_fault arch/x86/mm/fault.c:1466 [inline]
 exc_page_fault+0x3b3/0x6d0 arch/x86/mm/fault.c:1522
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:570
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:3511
 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3659
 release_pages+0xf7f/0xfe0 mm/swap.c:1063
 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:315
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu mm/mmu_gather.c:261 [inline]
 tlb_finish_mmu+0x1e0/0x3f0 mm/mmu_gather.c:361
 unmap_region+0x2c1/0x310 mm/mmap.c:2403
 do_mas_align_munmap+0xd05/0x1400 mm/mmap.c:2670
 do_mas_munmap+0x23e/0x2b0 mm/mmap.c:2728
 __vm_munmap+0x263/0x3a0 mm/mmap.c:3018
 __do_sys_munmap mm/mmap.c:3044 [inline]
 __se_sys_munmap mm/mmap.c:3040 [inline]
 __x64_sys_munmap+0x6b/0x80 mm/mmap.c:3040
 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff8881251f6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881251f7000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881251f7080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff8881251f7100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881251f7180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
EXT4-fs error (device loop4): ext4_check_all_de:655: inode #12: block 5: comm syz-executor.4: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, size=124 fake=0