CVE-2023-52760 Information

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In gfs2_put_super() whether withdrawn or not the quota should be cleaned up by gfs2_quota_cleanup().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.

Reference

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