diff --git a/[refs] b/[refs]
index a08621d3a533..2f34d78bbb28 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b35e286a640f31d619a637332972498b51f3fd90
+refs/heads/master: 4877e056192245b387aae004ab38f7f3899dd57c
diff --git a/trunk/lib/mpi/mpiutil.c b/trunk/lib/mpi/mpiutil.c
index 6bfc41f62b8f..26e4ed31e256 100644
--- a/trunk/lib/mpi/mpiutil.c
+++ b/trunk/lib/mpi/mpiutil.c
@@ -58,6 +58,9 @@ mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
 {
 	size_t len = nlimbs * sizeof(mpi_limb_t);
 
+	if (!len)
+		return NULL;
+
 	return kmalloc(len, GFP_KERNEL);
 }