From: Gerhard Sittig <redacted>
Date: Sun, 3 Jun 2018 06:37:10 +0000 (+0200)
Subject: input/logicport: silence a non-fatal glib runtime assertion
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=49d9a095e8611674466d10f4e8cba9078ae2d2c0;p=libsigrok.git

input/logicport: silence a non-fatal glib runtime assertion

Explicitly check GString pointers for validity before calling glib
routines that would access string content. This silences an assertion
error for a non-fatal runtime condition:

(process:17044): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed
---

diff --git a/src/input/logicport.c b/src/input/logicport.c
index 273b25d2..e165cb04 100644
--- a/src/input/logicport.c
+++ b/src/input/logicport.c
@@ -1133,7 +1133,8 @@ static void cleanup(struct sr_input *in)
 	 * and scalars, so that re-runs start out fresh again.
 	 */
 	g_free(inc->sw_version);
-	g_string_free(inc->cont_buff, TRUE);
+	if (inc->cont_buff)
+		g_string_free(inc->cont_buff, TRUE);
 	g_free(inc->sample_data_queue);
 	for (idx = 0; idx < inc->channel_count; idx++)
 		g_free(inc->wire_names[idx]);
@@ -1154,7 +1155,8 @@ static int reset(struct sr_input *in)
 	inc->ch_feed_prep = FALSE;
 	inc->header_sent = FALSE;
 	inc->rate_sent = FALSE;
-	g_string_truncate(in->buf, 0);
+	if (in->buf)
+		g_string_truncate(in->buf, 0);
 
 	return SR_OK;
 }