1 files changed, 1 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c513bbdf2d36..9547ab636274 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1201,7 +1201,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
         *p++ = htonl((u32)((n) >> 32));                         \
         *p++ = htonl((u32)(n));                                 \
 } while (0)
-#define WRITEMEM(ptr,nbytes)     do {                           \
+#define WRITEMEM(ptr,nbytes)     do if (nbytes > 0) {           \
         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
         memcpy(p, ptr, nbytes);                                 \
         p += XDR_QUADLEN(nbytes);                               \