1 files changed, 5 insertions, 0 deletions
diff --git a/src/mesa/main/debug.c b/src/mesa/main/debug.c
index 7b76a949698..d7e0143a8f6 100644
--- a/src/mesa/main/debug.c
+++ b/src/mesa/main/debug.c
@@ -235,6 +235,11 @@ write_ppm(const char *filename, const GLubyte *buffer, int width, int height,
       fprintf(f,"255\n");
       fclose(f);
       f = fopen( filename, "ab" );  /* reopen in binary append mode */
+      if (!f) {
+         fprintf(stderr, "Error while reopening %s in write_ppm()\n",
+                 filename);
+         return;
+      }
       for (y=0; y < height; y++) {
          for (x = 0; x < width; x++) {
             int yy = invert ? (height - 1 - y) : y;