message: Ensure that the "debug" field of error/warning/info messages is valid UTF-8

The caller might pass arbitrary data here that caused the error, and
trying to set invalid UTF-8 in a GstStructure causes it to be not set at
all. Later when trying to parse it, the field will not exist and the
return value will point to invalid memory. Prevent this by storing NULL
instead.

Also print a g_warning(), the caller should never ever do this to begin
with.

diff --git a/gst/gstmessage.c b/gst/gstmessage.c
index 764dfd8..a1d0d26 100644 (file)
--- a/gst/gstmessage.c
+++ b/gst/gstmessage.c
@@ -415,6 +415,12 @@ gst_message_new_error_with_details (GstObject * src, GError * error,
   GstMessage *message;
   GstStructure *structure;
 
+  if (!g_utf8_validate (debug, -1, NULL)) {
+    debug = NULL;
+    g_warning ("Trying to set debug field of error message, but "
+        "string is not valid UTF-8. Please file a bug.");
+  }
+
   structure = gst_structure_new_id (GST_QUARK (MESSAGE_ERROR),
       GST_QUARK (GERROR), G_TYPE_ERROR, error,
       GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
@@ -501,6 +507,12 @@ gst_message_new_warning_with_details (GstObject * src, GError * error,
   GstMessage *message;
   GstStructure *structure;
 
+  if (!g_utf8_validate (debug, -1, NULL)) {
+    debug = NULL;
+    g_warning ("Trying to set debug field of warning message, but "
+        "string is not valid UTF-8. Please file a bug.");
+  }
+
   structure = gst_structure_new_id (GST_QUARK (MESSAGE_WARNING),
       GST_QUARK (GERROR), G_TYPE_ERROR, error,
       GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);
@@ -585,6 +597,12 @@ gst_message_new_info_with_details (GstObject * src, GError * error,
   GstMessage *message;
   GstStructure *structure;
 
+  if (!g_utf8_validate (debug, -1, NULL)) {
+    debug = NULL;
+    g_warning ("Trying to set debug field of info message, but "
+        "string is not valid UTF-8. Please file a bug.");
+  }
+
   structure = gst_structure_new_id (GST_QUARK (MESSAGE_INFO),
       GST_QUARK (GERROR), G_TYPE_ERROR, error,
       GST_QUARK (DEBUG), G_TYPE_STRING, debug, NULL);