Release buffer on validation errors. My guess is that we previously just...

Release buffer on validation errors. My guess is that we previously just leaked the buffer owner in that case.

Cython/Utility/Buffer.c

@@ -742,7 +742,11 @@ static CYTHON_INLINE int __Pyx_GetBufferAndValidate(
     return 0;
   }
   buf->buf = NULL;
-  if (__Pyx_GetBuffer(obj, buf, flags) == -1) goto fail;
+  if (__Pyx_GetBuffer(obj, buf, flags) == -1) {
+    __Pyx_ZeroBuffer(buf);
+    return -1;
+  }
+  // From this point on, we have acquired the buffer and must release it on errors.
   if (buf->ndim != nd) {
     PyErr_Format(PyExc_ValueError,
                  "Buffer has wrong number of dimensions (expected %d, got %d)",
@@ -764,7 +768,7 @@ static CYTHON_INLINE int __Pyx_GetBufferAndValidate(
   if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
   return 0;
 fail:;
-  __Pyx_ZeroBuffer(buf);
+  __Pyx_SafeReleaseBuffer(buf);
   return -1;
 }