Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix unlikely race in gdlm_put_lock In gdlm_put_lock(), there is a small window of time in which the DFL_UNMOUNT flag has been set but the lockspace hasn't been released, yet. In that window, dlm may still call gdlm_ast() and gdlm_bast(). To prevent it from dereferencing freed glock objects, only free the glock if the lockspace has actually been released.

References 5

• git.kernel.org https://git.kernel.org/stable/c/279bde3bbb0ac0bad5c729dfa85983d75a5d7641
• git.kernel.org https://git.kernel.org/stable/c/28c4d9bc0708956c1a736a9e49fee71b65deee81
• git.kernel.org https://git.kernel.org/stable/c/4913592a3358f6ec366b8346b733d5e2360b08e1
• git.kernel.org https://git.kernel.org/stable/c/5fdc1474e678eea1700aa266c0b7c2c96f81dd0d
• git.kernel.org https://git.kernel.org/stable/c/64c61b4ac645222fa7b724cef616c1f862a72a40

Remediation