Fix multiple memory leaks in PLy_spi_execute_fetch_result: it would leak

memory if the result had zero rows, and also if there was any sort of error
while converting the result tuples into Python data.  Reported and partially
fixed by Andres Freund.

Back-patch to all supported versions.  Note: I haven't tested the 7.4 fix.
7.4's configure check for python is so obsolete it doesn't work on my
current machines :-(.  The logic change is pretty straightforward though.

diff --git a/src/pl/plpython/plpython.c b/src/pl/plpython/plpython.c
index aa6ac71cb1ef402f58af1d96a714ca8f2b3f7c9b..3d422eb7e8a0f4701efbc95423c44e133d5ff956 100644 (file)
--- a/src/pl/plpython/plpython.c
+++ b/src/pl/plpython/plpython.c
@@ -1,7 +1,7 @@
 /**********************************************************************
  * plpython.c - python as a procedural language for PostgreSQL
  *
- *     $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.106.2.2 2010/02/18 23:50:20 tgl Exp $
+ *     $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.106.2.3 2010/04/30 19:15:58 tgl Exp $
  *
  *********************************************************************
  */
@@ -2678,9 +2678,6 @@ PLy_spi_execute_fetch_result(SPITupleTable *tuptable, int rows, int status)
 
                                        PyList_SetItem(result->rows, i, row);
                                }
-                               PLy_typeinfo_dealloc(&args);
-
-                               SPI_freetuptable(tuptable);
                        }
                }
                PG_CATCH();
@@ -2691,11 +2688,15 @@ PLy_spi_execute_fetch_result(SPITupleTable *tuptable, int rows, int status)
                        if (!PyErr_Occurred())
                                PyErr_SetString(PLy_exc_error,
                                                        "Unknown error in PLy_spi_execute_fetch_result");
-                       Py_DECREF(result);
                        PLy_typeinfo_dealloc(&args);
+                       SPI_freetuptable(tuptable);
+                       Py_DECREF(result);
                        return NULL;
                }
                PG_END_TRY();
+
+               PLy_typeinfo_dealloc(&args);
+               SPI_freetuptable(tuptable);
        }
 
        return (PyObject *) result;