[syzbot] [fuse?] general protection fault in fuse_do_readpage

[syzbot]

Hello,

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

Reported-by: syzbot+0b1279812c46e48bb0c1 at syzkaller.appspotmail.com
Tested-by: syzbot+0b1279812c46e48bb0c1 at syzkaller.appspotmail.com

Tested on:

commit:         779014de erofs: fix file-backed mounts over FUSE
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=155294c0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2effb62852f5a821
dashboard link: https://syzkaller.appspot.com/bug?extid=0b1279812c46e48bb0c1
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

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