diff --git a/lz4/block/_block.c b/lz4/block/_block.c
index 993cc44..4b7dc38 100644
--- a/lz4/block/_block.c
+++ b/lz4/block/_block.c
@@ -215,6 +215,8 @@ compress (PyObject * Py_UNUSED (self), PyObject * args, PyObject * kwargs)
   dest = PyMem_Malloc (total_size * sizeof * dest);
   if (dest == NULL)
     {
+      PyBuffer_Release(&source);
+      PyBuffer_Release(&dict);
       return PyErr_NoMemory();
     }
 
@@ -349,6 +351,8 @@ decompress (PyObject * Py_UNUSED (self), PyObject * args, PyObject * kwargs)
   dest = PyMem_Malloc (dest_size * sizeof * dest);
   if (dest == NULL)
     {
+      PyBuffer_Release(&source);
+      PyBuffer_Release(&dict);
       return PyErr_NoMemory();
     }
 
diff --git a/lz4/frame/_frame.c b/lz4/frame/_frame.c
index 440b0b5..eb1c76b 100644
--- a/lz4/frame/_frame.c
+++ b/lz4/frame/_frame.c
@@ -184,6 +184,7 @@ compress (PyObject * Py_UNUSED (self), PyObject * args,
     }
   else if (block_checksum)
     {
+      PyBuffer_Release(&source);
       PyErr_SetString (PyExc_RuntimeError,
                        "block_checksum specified but not supported by LZ4 library version");
       return NULL;
@@ -383,6 +384,7 @@ compress_begin (PyObject * Py_UNUSED (self), PyObject * args,
 
   if (LZ4F_isError (result))
     {
+      PyMem_Free (destination);
       PyErr_Format (PyExc_RuntimeError,
                     "LZ4F_compressBegin failed with code: %s",
                     LZ4F_getErrorName (result));
@@ -1115,6 +1117,7 @@ __decompress(LZ4F_dctx * context, char * source, size_t source_size,
               buff = PyMem_Realloc (destination, destination_size);
               if (buff == NULL)
                 {
+                  PyMem_Free (destination);
                   PyErr_SetString (PyExc_RuntimeError,
                                    "Failed to resize buffer");
                   return NULL;
diff --git a/lz4/stream/_stream.c b/lz4/stream/_stream.c
index 4c51d89..e92f8a8 100644
--- a/lz4/stream/_stream.c
+++ b/lz4/stream/_stream.c
@@ -1063,7 +1063,7 @@ _compress_bound (PyObject * Py_UNUSED (self), PyObject * args)
   /* Positional arguments: input_size
    * Keyword arguments   : none
    */
-  if (!PyArg_ParseTuple (args, "OI", &input_size))
+  if (!PyArg_ParseTuple (args, "I", &input_size))
     {
       goto exit_now;
     }
@@ -1211,6 +1211,7 @@ _compress (PyObject * Py_UNUSED (self), PyObject * args)
 
   if (context->strategy.ops->update_context_after_process (context) != 0)
     {
+      Py_CLEAR (py_dest);
       PyErr_Format (PyExc_RuntimeError, "Internal error");
       goto exit_now;
     }