==================================================================
BUG: KASAN: use-after-free in ext4_ext_binsearch_idx fs/ext4/extents.c:759 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0x697/0xd80 fs/ext4/extents.c:924
Read of size 4 at addr ffff88810979e268 by task syz-executor202/407

CPU: 1 PID: 407 Comm: syz-executor202 Not tainted 5.15.78-syzkaller-00911-gc73b4619ad86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_address_description+0x87/0x3d0 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_ext_binsearch_idx fs/ext4/extents.c:759 [inline]
 ext4_find_extent+0x697/0xd80 fs/ext4/extents.c:924
 ext4_clu_mapped+0xbb/0x950 fs/ext4/extents.c:5806
 ext4_insert_delayed_block fs/ext4/inode.c:1683 [inline]
 ext4_da_map_blocks fs/ext4/inode.c:1793 [inline]
 ext4_da_get_block_prep+0xa16/0x1410 fs/ext4/inode.c:1857
 __block_write_begin_int+0x6ae/0x17a0 fs/buffer.c:2012
 __block_write_begin+0x30/0x40 fs/buffer.c:2062
 ext4_da_convert_inline_data_to_extent fs/ext4/inline.c:892 [inline]
 ext4_da_write_inline_data_begin+0x4ff/0xc70 fs/ext4/inline.c:965
 ext4_da_write_begin+0x533/0xbf0 fs/ext4/inode.c:2996
 generic_perform_write+0x2cd/0x5d0 mm/filemap.c:3825
 ext4_buffered_write_iter+0x49b/0x630 fs/ext4/file.c:271
 ext4_file_write_iter+0x448/0x1cc0
 call_write_iter include/linux/fs.h:2138 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0xc8d/0x1050 fs/read_write.c:594
 ksys_write+0x198/0x2c0 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fad587067b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff754e6698 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fad587067b9
RDX: 00000000175d9003 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007fad586c6050 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000079f R11: 0000000000000246 R12: 00007fad586c60e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

The buggy address belongs to the page:
page:ffffea000425e780 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10979e
flags: 0x4000000000000000(zone=1)
raw: 4000000000000000 ffffea000425e788 ffffea000425e788 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88810979e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88810979e180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88810979e200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff88810979e280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff