gfs2: Fix slab-use-after-free in gfs2_qd_dealloc

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix slab-use-after-free in gfs2_qd_dealloc In gfs2_put_super(), whether withdrawn or not, the quota should be cleaned up by gfs2_quota_cleanup(). Otherwise, struct gfs2_sbd will be freed before gfs2_qd_dealloc (rcu callback) has run for all gfs2_quota_data objects, resulting in use-after-free. Also, gfs2_destroy_threads() and gfs2_quota_cleanup() is already called by gfs2_make_fs_ro(), so in gfs2_put_super(), after calling gfs2_make_fs_ro(), there is no need to call them again.

References

• https://git.kernel.org/stable/c/08a28272faa750d4357ea2cb48d2baefd778ea81
• https://git.kernel.org/stable/c/bdcb8aa434c6d36b5c215d02a9ef07551be25a37