CVE-2024-56743

Summary

CVE-2024-56743 is a vulnerability affecting the Linux kernel that has been addressed. The issue lies in the nfsd_file_put function, where the RCU (Read-Copy Update) lock is held during a call to nfsd_file_put_local, which is unnecessary. This resulted in the error message "Voluntary context switch within RCU read-side critical section!" and caused a panic during certain operations. The call to nfs_to->nfsd_serv_put is the one that requires the RCU, so the holding of the lock has been moved to that location instead. This patch resolves the issue and fixes related test cases.

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