kernel: mm: swap: fix race between free_swap_and_cache() and swapoff()

In the Linux kernel, the following vulnerability has been resolved: mm: swap: fix race between freeswapandcache and swapoff The Linux kernel CVE team has assigned CVE-2024-26960 to this issue. Upstream advisory: https://lore.kernel.org/linux-cve-announce/2024050129-CVE-2024-26960-ad6b@gregkh/T...