diff --git a/[refs] b/[refs]
index d0a92f8e3117..8a264a6ba463 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e87c5e35a92e045de75fb6ae9846a38bdd0f92bd
+refs/heads/master: e2fe85c236736c866481de288f636ab06ef49787
diff --git a/trunk/lib/mpi/mpi-div.c b/trunk/lib/mpi/mpi-div.c
index c3087d1390ce..8a45717bd001 100644
--- a/trunk/lib/mpi/mpi-div.c
+++ b/trunk/lib/mpi/mpi-div.c
@@ -149,6 +149,9 @@ int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den)
 	mpi_ptr_t marker[5];
 	int markidx = 0;
 
+	if (!dsize)
+		return -EINVAL;
+
 	memset(marker, 0, sizeof(marker));
 
 	/* Ensure space is enough for quotient and remainder.