==================================================================
BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:199 [inline]
BUG: KASAN: use-after-free in ext4_convert_inline_data_nolock+0x31a/0xd80 fs/ext4/inline.c:1204
Read of size 20 at addr ffff88807d9a51a3 by task syz-executor.0/25601

CPU: 1 PID: 25601 Comm: syz-executor.0 Not tainted 6.3.0-rc6-syzkaller-00034-ge62252bc55b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:319 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:430
 kasan_report+0x176/0x1b0 mm/kasan/report.c:536
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 ext4_read_inline_data fs/ext4/inline.c:199 [inline]
 ext4_convert_inline_data_nolock+0x31a/0xd80 fs/ext4/inline.c:1204
 ext4_convert_inline_data+0x4da/0x620 fs/ext4/inline.c:2065
 ext4_fallocate+0x14d/0x2050 fs/ext4/extents.c:4701
 vfs_fallocate+0x54b/0x6b0 fs/open.c:324
 ksys_fallocate fs/open.c:347 [inline]
 __do_sys_fallocate fs/open.c:355 [inline]
 __se_sys_fallocate fs/open.c:353 [inline]
 __x64_sys_fallocate+0xbd/0x100 fs/open.c:353
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb4d588c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb4d6531168 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb4d59abf80 RCX: 00007fb4d588c169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fb4d58e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc8920c10f R14: 00007fb4d6531300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001f66940 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2 pfn:0x7d9a5
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 ffffffff00000101 0000000000000000
raw: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 29375, tgid 29375 (udevd), ts 1765818705217, free_ts 1772668239707
 prep_new_page mm/page_alloc.c:2553 [inline]
 get_page_from_freelist+0x3246/0x33c0 mm/page_alloc.c:4326
 __alloc_pages+0x255/0x670 mm/page_alloc.c:5592
 alloc_slab_page+0x6a/0x160 mm/slub.c:1851
 allocate_slab mm/slub.c:1998 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2051
 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3193
 __slab_alloc mm/slub.c:3292 [inline]
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:3476
 getname_flags+0xbc/0x4e0 fs/namei.c:140
 user_path_at_empty+0x2e/0x180 fs/namei.c:2876
 user_path_at include/linux/namei.h:57 [inline]
 do_utimes_path fs/utimes.c:95 [inline]
 do_utimes+0x115/0x270 fs/utimes.c:145
 __do_sys_utimensat fs/utimes.c:164 [inline]
 __se_sys_utimensat fs/utimes.c:148 [inline]
 __x64_sys_utimensat+0x14f/0x250 fs/utimes.c:148
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1454 [inline]
 free_pcp_prepare mm/page_alloc.c:1504 [inline]
 free_unref_page_prepare+0xe2f/0xe70 mm/page_alloc.c:3388
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:3483
 discard_slab mm/slub.c:2098 [inline]
 __unfreeze_partials+0x1b1/0x1f0 mm/slub.c:2637
 put_cpu_partial+0x116/0x180 mm/slub.c:2713
 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:769
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc_lru+0x11f/0x2e0 mm/slub.c:3483
 alloc_inode_sb include/linux/fs.h:2686 [inline]
 xfs_inode_alloc+0x88/0x6c0 fs/xfs/xfs_icache.c:81
 xfs_iget_cache_miss fs/xfs/xfs_icache.c:585 [inline]
 xfs_iget+0xad2/0x2fd0 fs/xfs/xfs_icache.c:751
 xfs_qm_dqusage_adjust+0x228/0x670 fs/xfs/xfs_qm.c:1157
 xfs_iwalk_ag_recs+0x486/0x7c0 fs/xfs/xfs_iwalk.c:220
 xfs_iwalk_run_callbacks+0x25b/0x490 fs/xfs/xfs_iwalk.c:376
 xfs_iwalk_ag+0xad6/0xbd0 fs/xfs/xfs_iwalk.c:482
 xfs_iwalk_ag_work+0xfb/0x1b0 fs/xfs/xfs_iwalk.c:624

Memory state around the buggy address:
 ffff88807d9a5080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807d9a5100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88807d9a5180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88807d9a5200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807d9a5280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================