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-rw-r--r--fs/nfsd/nfs4state.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index efa3d4c..ed58ced 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2385,6 +2385,15 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
status = nfserr_inval;
goto out_nolock;
}
+ /*
+ * Sometimes userspace doesn't give us a principal.
+ * Which is a bug, really. Anyway, we can't enforce
+ * MACH_CRED in that case, better to give up now:
+ */
+ if (!new->cl_cred.cr_principal) {
+ status = nfserr_serverfault;
+ goto out_nolock;
+ }
new->cl_mach_cred = true;
case SP4_NONE:
break;
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