Ignore null pointer on Fc*Destroy functions

Fixes https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/339

1 files changed, 10 insertions, 7 deletions

diff --git a/src/fcptrlist.c b/src/fcptrlist.c
index bb88832..07428a4 100644
--- a/src/fcptrlist.c
+++ b/src/fcptrlist.c
@@ -57,15 +57,18 @@ FcPtrListDestroy (FcPtrList *list)
 {
     FcPtrListIter iter;
 
-    FcPtrListIterInit (list, &iter);
-    do
+    if (list)
     {
-	if (FcPtrListIterGetValue (list, &iter))
-	    list->destroy_func (FcPtrListIterGetValue (list, &iter));
-	FcPtrListIterRemove (list, &iter);
-    } while (FcPtrListIterIsValid (list, &iter));
+	FcPtrListIterInit (list, &iter);
+	do
+	{
+	    if (FcPtrListIterGetValue (list, &iter))
+		list->destroy_func (FcPtrListIterGetValue (list, &iter));
+	    FcPtrListIterRemove (list, &iter);
+	} while (FcPtrListIterIsValid (list, &iter));
 
-    free (list);
+	free (list);
+    }
 }
 
 void