From: Uwe Hermann <redacted>
Date: Tue, 12 Nov 2019 21:47:41 +0000 (+0100)
Subject: srd_decoder_doc_get(): Add an additional sanity check.
X-Git-Url: http://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commitdiff_plain;h=f8c24e2e58ee76e6bdc50b87060e2efb7e8838ba

srd_decoder_doc_get(): Add an additional sanity check.
---

diff --git a/decoder.c b/decoder.c
index 5239818..cef4f29 100644
--- 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();
diff --git a/tests/decoder.c b/tests/decoder.c
index 3678410..3acabae 100644
--- a/tests/decoder.c
+++ b/tests/decoder.c
@@ -404,11 +404,19 @@ END_TEST
  * Check whether srd_decoder_doc_get() fails with NULL as argument.
  * If it returns a value != NULL (or segfaults) this test will fail.
  * See also: http://sigrok.org/bugzilla/show_bug.cgi?id=179
+ * Check whether srd_decoder_doc_get() fails with dec->py_mod == NULL.
+ * If it returns a value != NULL (or segfaults) this test will fail.
+ * See also: http://sigrok.org/bugzilla/show_bug.cgi?id=180
  */
 START_TEST(test_doc_get_null)
 {
+	struct srd_decoder dec;
+
+	dec.py_mod = NULL;
+
 	srd_init(DECODERS_TESTDIR);
 	fail_unless(srd_decoder_doc_get(NULL) == NULL);
+	fail_unless(srd_decoder_doc_get(&dec) == NULL);
 	srd_exit();
 }
 END_TEST