[syzbot] [iomap?] [erofs?] WARNING in iomap_iter (5)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+d8f000c609f05f52d9b5 at syzkaller.appspotmail.com
Tested-by: syzbot+d8f000c609f05f52d9b5 at syzkaller.appspotmail.com

Tested on:

commit:         0097d266 erofs: refuse crafted out-of-file-range encod..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git dev-test
console output: https://syzkaller.appspot.com/x/log.txt?x=1732b5d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=162faeb2d1eaefb4
dashboard link: https://syzkaller.appspot.com/bug?extid=d8f000c609f05f52d9b5
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.