1 This patch comes from upstream: http://bugs.python.org/issue21831

     2 

     3 --- a/Objects/bufferobject.c

     4 +++ b/Objects/bufferobject.c

     5 @@ -88,7 +88,7 @@ get_buf(PyBufferObject *self, void **ptr

     6              *size = count;

     7          else

     8              *size = self->b_size;

     9 -        if (offset + *size > count)

    10 +        if (*size > count - offset)

    11              *size = count - offset;

    12      }

    13      return 1;