srd_inst_option_set(): Fix multiple memory leaks.

These were reported when compiling with "-fsanitize=address" and running
"PYTHONMALLOC=malloc make check":

  =================================================================
  ==42879==ERROR: LeakSanitizer: detected memory leaks

  Direct leak of 317 byte(s) in 6 object(s) allocated from:
      #0 0x7f08e4809538 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144
      #1 0x7f08e3f37622 in PyUnicode_New ../Objects/unicodeobject.c:1365

  Direct leak of 28 byte(s) in 1 object(s) allocated from:
      #0 0x7f08e4809538 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144
      #1 0x7f08e3f7e1a5 in _PyLong_New ../Objects/longobject.c:275

  Direct leak of 24 byte(s) in 1 object(s) allocated from:
      #0 0x7f08e4809538 in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144
      #1 0x7f08e3f91521 in PyFloat_FromDouble ../Objects/floatobject.c:122

  SUMMARY: AddressSanitizer: 369 byte(s) leaked in 8 allocation(s).
   session

diff --git a/instance.c b/instance.c
index 85ff37e42e42e45fdc36416accd06d0de02b1196..fc03174c9779bcba6d9390140d10b4f7c9c9f3a8 100644 (file)
--- a/instance.c
+++ b/instance.c
@@ -182,10 +182,13 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
                                goto err_out;
                        }
                }
-               if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1)
+               if (PyDict_SetItemString(py_di_options, sdo->id, py_optval) == -1) {
+                       Py_XDECREF(py_optval);
                        goto err_out;
+               }
                /* Not harmful even if we used the default. */
                g_hash_table_remove(options, sdo->id);
+               Py_XDECREF(py_optval);
        }
        if (g_hash_table_size(options) != 0)
                srd_warn("Unknown options specified for '%s'", di->inst_id);
@@ -193,7 +196,6 @@ SRD_API int srd_inst_option_set(struct srd_decoder_inst *di,
        ret = SRD_OK;
 
 err_out:
-       Py_XDECREF(py_optval);
        if (PyErr_Occurred()) {
                srd_exception_catch("Stray exception in srd_inst_option_set()");
                ret = SRD_ERR_PYTHON;