sys/dvb/camutils.c: Do not assume "descriptors" property in the pmt structure is present.

Original commit message from CVS:
* sys/dvb/camutils.c:
Do not assume "descriptors" property in the pmt structure
is present.
Fixes #516499.

1 files changed, 8 insertions, 7 deletions

diff --git a/sys/dvb/camutils.c b/sys/dvb/camutils.c
index f52412d7..1eb32175 100644
--- a/sys/dvb/camutils.c
+++ b/sys/dvb/camutils.c
@@ -231,13 +231,14 @@ cam_build_ca_pmt (GstStructure * pmt, guint8 list_management, guint8 cmd_id,
   gst_structure_get_uint (pmt, "version-number", &version_number);
   streams = gst_structure_get_value (pmt, "streams");
   value = gst_structure_get_value (pmt, "descriptors");
-  program_descriptors = g_value_get_boxed (value);
-  /* get the length of program level CA_descriptor()s */
-  len = get_ca_descriptors_length (program_descriptors);
-  if (len > 0)
-    /* add one byte for the program level cmd_id */
-    len += 1;
-
+  if (value != NULL) {
+    program_descriptors = g_value_get_boxed (value);
+    /* get the length of program level CA_descriptor()s */
+    len = get_ca_descriptors_length (program_descriptors);
+    if (len > 0)
+      /* add one byte for the program level cmd_id */
+      len += 1;
+  }
   lengths = g_list_append (lengths, GINT_TO_POINTER (len));
   body_size += 6 + len;