Trond Myklebust 9c07b75b80 NFS: Fix a race in __nfs_list_for_each_server() ...

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: 3c9e502b59 ("NFS: Add a helper nfs_client_for_each_server()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

2020-04-30 15:08:26 -04:00

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