CVE-2022-49747

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> erofs/zmap.c: Fix incorrect offset calculation<br /> <br /> Effective offset to add to length was being incorrectly calculated,<br /> which resulted in iomap-&gt;length being set to 0, triggering a WARN_ON<br /> in iomap_iter_done().<br /> <br /> Fix that, and describe it in comments.<br /> <br /> This was reported as a crash by syzbot under an issue about a warning<br /> encountered in iomap_iter_done(), but unrelated to erofs.<br /> <br /> C reproducer: https://syzkaller.appspot.com/text?tag=ReproC&amp;x=1037a6b2880000<br /> Kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&amp;x=e2021a61197ebe02<br /> Dashboard link: https://syzkaller.appspot.com/bug?extid=a8e049cd3abd342936b6