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-rw-r--r--lib/mpi/mpi-div.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/mpi/mpi-div.c b/lib/mpi/mpi-div.c
index c3087d1390c..8a45717bd00 100644
--- a/lib/mpi/mpi-div.c
+++ b/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.