dlm: fix dlm_recover_members refcount on error

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: dlm: fix dlm_recover_members refcount on error If dlm_recover_members() fails we don't drop the references of the previous created root_list that holds and keep all rsbs alive during the recovery. It might be not an unlikely event because ping_members() could run into an -EINTR if another recovery progress was triggered again.

References

• https://git.kernel.org/stable/c/3230718a75a6c30ed60ac920c26be2119fa82b8e
• https://git.kernel.org/stable/c/fb2ec564887af1f365d754f7c306f1b5cd375b5e
• https://git.kernel.org/stable/c/200b977ebbc313a59174ba971006a231b3533dc5