CVE-2023-52448 gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix kernel NULL pointer dereference in gfs2rgrpdump Syzkaller has reported a NULL pointer dereference when accessing rgd-rdrgl in gfs2rgrpdump. This can happen when creating rgd-rdgl fails in readrindexentry. Add a NULL...