diff --git a/glamor/glamor_largepixmap.c b/glamor/glamor_largepixmap.c
index 3467eb800..d8aa2e6d4 100644
--- a/glamor/glamor_largepixmap.c
+++ b/glamor/glamor_largepixmap.c
@@ -82,6 +82,10 @@ __glamor_compute_clipped_regions(int block_w,
     clipped_regions = calloc((end_block_x - start_block_x + 1)
                              * (end_block_y - start_block_y + 1),
                              sizeof(*clipped_regions));
+    if (!clipped_regions) {
+        *n_region = 0;
+        return NULL;
+    }
 
     DEBUGF("startx %d starty %d endx %d endy %d \n",
            start_x, start_y, end_x, end_y);
@@ -222,6 +226,11 @@ glamor_compute_clipped_regions_ext(PixmapPtr pixmap,
                                inner_block_w)
                             * ((block_h + inner_block_h - 1) /
                                inner_block_h), sizeof(*result_regions));
+    if (!result_regions) {
+        *n_region = 0;
+        return NULL;
+    }
+
     k = 0;
     for (i = 0; i < *n_region; i++) {
         x = box_array[clipped_regions[i].block_idx].x1;
@@ -368,6 +377,11 @@ _glamor_compute_clipped_regions(PixmapPtr pixmap,
     DEBUGRegionPrint(region);
     if (glamor_pixmap_priv_is_small(pixmap_priv)) {
         clipped_regions = calloc(1, sizeof(*clipped_regions));
+        if (!clipped_regions) {
+            *n_region = 0;
+            return NULL;
+        }
+
         clipped_regions[0].region = RegionCreate(NULL, 1);
         clipped_regions[0].block_idx = 0;
         RegionCopy(clipped_regions[0].region, region);