md: fix mddev uaf while iterating all_mddevs list

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Astra Linux – Vulnerability found in Linux 6.1, Linux 6.12

In the Linux kernel, the following vulnerabilities have been resolved: md: fixed the UAF issue when iterating the allmddevs list While iterating the allmddevs list from mdnotifyreboot and mdexit, listforeachentry Safe is used. This can lead to a race condition with deletint, causing a UAF: t1:...