From 814dace37b5f546439df53b51c3a08afabfd10aa Mon Sep 17 00:00:00 2001
From: Sven Verdoolaege <sven.verdoolaege@gmail.com>
Date: Fri, 8 Sep 2017 12:36:52 +0200
Subject: [PATCH] isl_mat_drop_cols: check for valid column range

Signed-off-by: Sven Verdoolaege <sven.verdoolaege@gmail.com>
---
 isl_mat.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/isl_mat.c b/isl_mat.c
index b0ea0e0c..d4445762 100644
--- a/isl_mat.c
+++ b/isl_mat.c
@@ -1401,8 +1401,8 @@ struct isl_mat *isl_mat_drop_cols(struct isl_mat *mat, unsigned col, unsigned n)
 		return mat;
 
 	mat = isl_mat_cow(mat);
-	if (!mat)
-		return NULL;
+	if (check_col_range(mat, col, n) < 0)
+		return isl_mat_free(mat);
 
 	if (col != mat->n_col-n) {
 		for (r = 0; r < mat->n_row; ++r)
-- 
2.11.4.GIT