CVE-2024-42079 Information

Description

In the Linux kernel the following vulnerability has been resolved:

gfs2: Fix NULL pointer dereference in gfs2_log_flush

In gfs2_jindex_free() set sdp->sd_jdesc to NULL under the log flush lock to provide exclusion against gfs2_log_flush().

In gfs2_log_flush() check if sdp->sd_jdesc is non-NULL before dereferencing it. Otherwise we could run into a NULL pointer dereference when outstanding glock work races with an unmount (glock_work_func -> run_queue -> do_xmote -> inode_go_sync -> gfs2_log_flush).

Reference

https://git.kernel.org/stable/c/3429ef5f50909cee9e498c50f0c499b9397116ce https://git.kernel.org/stable/c/f54f9d5368a4e92ede7dd078a62788dae3a7c6ef https://git.kernel.org/stable/c/35264909e9d1973ab9aaa2a1b07cda70f12bb828