From c1bf17839e9ea84ddd8368faa7f417441931ecb1 Mon Sep 17 00:00:00 2001
From: Weijia Wang <9713184+wegank@users.noreply.github.com>
Date: Mon, 15 Dec 2025 00:49:36 +0100
Subject: [PATCH] Fix heap overflow on computing parametrizations in
 non-shape-position case

---
 src/fglm/fglm_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/fglm/fglm_core.c b/src/fglm/fglm_core.c
index 59da3756..87f61455 100644
--- a/src/fglm/fglm_core.c
+++ b/src/fglm/fglm_core.c
@@ -1280,7 +1280,7 @@ int compute_parametrizations_non_shape_position_case(param_t *param,
         }
         else{
           nmod_poly_fit_length(param->coords[nvars-2-nc],
-                               param->elim->length-1 );
+                               FLINT_MAX(2, param->elim->length-1) );
           param->coords[nvars-2-nc]->length = data_bms->BMS->R1->length ;
           param->coords[nvars-2-nc]->coeffs[0] = 0;
           param->coords[nvars-2-nc]->coeffs[1] = 0;