srd_decoder_doc_get(): Add an additional sanity check.

[libsigrokdecode.git] / decoder.c

diff --git a/decoder.c b/decoder.c
index 5239818faa33a8fb9b8f8e4cd55faf5cba69a774..cef4f299aea927d76d64adbb8ba9dcc39a2bf927 100644 (file)
--- a/decoder.c
+++ b/decoder.c
@@ -869,7 +869,7 @@ err_out:
 /**
  * Return a protocol decoder's docstring.
  *
- * @param dec The loaded protocol decoder.
+ * @param dec The loaded protocol decoder. Must not be NULL.
  *
  * @return A newly allocated buffer containing the protocol decoder's
  *         documentation. The caller is responsible for free'ing the buffer.
@@ -885,7 +885,7 @@ SRD_API char *srd_decoder_doc_get(const struct srd_decoder *dec)
        if (!srd_check_init())
                return NULL;
 
-       if (!dec)
+       if (!dec || !dec->py_mod)
                return NULL;
 
        gstate = PyGILState_Ensure();