1 files changed, 4 insertions, 1 deletions

diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 986f9b32083c..b86e3658a0af 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -313,8 +313,11 @@ nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
          * Round the length of the data which was specified up to
          * the next multiple of XDR units and then compare that
          * against the length which was actually received.
+         * Note that when RPCSEC/GSS (for example) is used, the
+         * data buffer can be padded so dlen might be larger
+         * than required.  It must never be smaller.
          */
-        if (dlen != XDR_QUADLEN(len)*4)
+        if (dlen < XDR_QUADLEN(len)*4)
                 return 0;
 
         rqstp->rq_vec[0].iov_base = (void*)p;