mg2d: enforce a minimum domain size of 3 points

1 files changed, 1 insertions, 1 deletions

diff --git a/mg2d.c b/mg2d.c
index c036cf2..eb4efaf 100644
--- a/mg2d.c
+++ b/mg2d.c
@@ -481,7 +481,7 @@ MG2DContext *mg2d_solver_alloc(size_t domain_size)
     MG2DInternal *priv;
     int ret;
 
-    if (SIZE_MAX / domain_size < domain_size)
+    if (domain_size < 3 || SIZE_MAX / domain_size < domain_size)
         return NULL;
 
     ctx = calloc(1, sizeof(*ctx));