Merge pull request #4381 from radarhere/memory

Release buffer if function returns prematurely

Author: hugovk

src/map.c

@@ -354,17 +354,21 @@ PyImaging_MapBuffer(PyObject* self, PyObject* args)
 
  if (view.len < 0) {
  PyErr_SetString(PyExc_ValueError, "buffer has negative size");
+ PyBuffer_Release(&view);
  return NULL;
  }
  if (offset + size > view.len) {
  PyErr_SetString(PyExc_ValueError, "buffer is not large enough");
+ PyBuffer_Release(&view);
  return NULL;
  }
 
  im = ImagingNewPrologueSubtype(
  mode, xsize, ysize, sizeof(ImagingBufferInstance));
- if (!im)
+ if (!im) {
+ PyBuffer_Release(&view);
  return NULL;
+ }
 
  /* setup file pointers */
  if (ystep > 0)