4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "J. Bruce Fields" <[email protected]>

commit 980608fb50aea34993ba956b71cd4602aa42b14b upstream.

If the client uses a special stateid then we'll pass a NULL file to
vfs_llseek.

Fixes: 24bab491220f " NFSD: Implement SEEK"
Cc: Anna Schumaker <[email protected]>
Reported-by: Christoph Hellwig <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 fs/nfsd/nfs4proc.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1071,6 +1071,8 @@ nfsd4_seek(struct svc_rqst *rqstp, struc
                dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
                return status;
        }
+       if (!file)
+               return nfserr_bad_stateid;
 
        switch (seek->seek_whence) {
        case NFS4_CONTENT_DATA:


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