pyyaml: catch recursion exceptions (#8227)

Fixes: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=50061

projects/pyyaml/fuzz_loader.py

@@ -28,6 +28,8 @@ def TestOneInput(input_bytes):
     context = yaml.load(input_bytes, Loader=yaml.FullLoader)
   except yaml.YAMLError:
     pass
+  except RecursionError:
+    pass
 
 def main():
   atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)

projects/pyyaml/fuzz_reader.py

@@ -28,6 +28,8 @@ def TestOneInput(data):
             stream.forward()
     except yaml.reader.ReaderError:
         None
+    except RecursionError:
+        pass
 
     return