Could you fold the below into this patch?  Without this the server can
oops on attempts to access a filesystem not exported to the request's
source address!  Thanks to Olga Kornievskaia for the testing that found
this.

--b.

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 333e5cf..582b494 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1261,7 +1261,7 @@ gss:
                                                &rqstp->rq_chandle);
        if (PTR_ERR(gssexp) == -ENOENT)
                return exp;
-       if (exp)
+       if (exp && !IS_ERR(exp))
                exp_put(exp);
        return gssexp;
 }
@@ -1291,7 +1291,7 @@ gss:
                                                &rqstp->rq_chandle);
        if (PTR_ERR(gssexp) == -ENOENT)
                return exp;
-       if (exp)
+       if (exp && !IS_ERR(exp))
                exp_put(exp);
        return gssexp;
 }
-
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