diff --git a/.gitlab-ci/fedora-base.Dockerfile b/.gitlab-ci/fedora-base.Dockerfile
index 0237b3804b..c9e428d54c 100644
--- a/.gitlab-ci/fedora-base.Dockerfile
+++ b/.gitlab-ci/fedora-base.Dockerfile
@@ -41,6 +41,7 @@ RUN dnf -y install \
     itstool \
     json-glib-devel \
     lcov \
+    libasan \
     libattr-devel \
     libepoxy-devel \
     libffi-devel \
diff --git a/testsuite/gdk/memorytexture.c b/testsuite/gdk/memorytexture.c
index b43281e6b2..3f941cdb29 100644
--- a/testsuite/gdk/memorytexture.c
+++ b/testsuite/gdk/memorytexture.c
@@ -93,7 +93,7 @@ create_texture (GdkMemoryFormat  format,
   guchar *data;
   int x, y;
 
-  data = g_malloc (height * stride);
+  data = g_malloc (height * MAX (stride, tests[format].bytes_per_pixel));
   for (y = 0; y < height; y++)
     for (x = 0; x < width; x++)
       {
@@ -102,7 +102,7 @@ create_texture (GdkMemoryFormat  format,
                 tests[format].bytes_per_pixel);
       }
 
-  bytes = g_bytes_new_static (data, height * stride);
+  bytes = g_bytes_new_static (data, height * MAX (stride, tests[format].bytes_per_pixel));
   texture = gdk_memory_texture_new (width, height,
                                     format,
                                     bytes,