NFS: Fix a race in __nfs_list_for_each_server()
commit 9c07b75b upstream. The struct nfs_server gets put on the cl_superblocks list before the server->super field has been initialised, in which case the call to nfs_sb_active() will Oops. Add a check to ensure that we skip such a list entry. Fixes: 3c9e502b ("NFS: Add a helper nfs_client_for_each_server()") Signed-off-by:Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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