Only report CRC Status when we know it to be valid.

svn path=/trunk/; revision=27841

3 files changed, 30 insertions, 15 deletions

diff --git a/epan/dissectors/packet-catapult-dct2000.c b/epan/dissectors/packet-catapult-dct2000.c
index 37cc2718de..610dbb3b3b 100644
--- a/epan/dissectors/packet-catapult-dct2000.c
+++ b/epan/dissectors/packet-catapult-dct2000.c
@@ -1326,7 +1326,7 @@ static void attach_mac_lte_info(packet_info *pinfo)
     }
 
     /* Populate the struct from outhdr values */
-    p_mac_lte_info->crcStatus = TRUE;
+    p_mac_lte_info->crcStatusValid = FALSE;
 
     p_mac_lte_info->radioType = outhdr_values[i++];
     p_mac_lte_info->rntiType = outhdr_values[i++];
@@ -1340,10 +1340,20 @@ static void attach_mac_lte_info(packet_info *pinfo)
         p_mac_lte_info->reTxCount = outhdr_values[i++];
     }
     if (outhdr_values_found > 9) {
-        p_mac_lte_info->crcStatus = outhdr_values[i++];
+        /* CRC only valid for DL-SCH */
+        if ((p_mac_lte_info->direction == DIRECTION_DOWNLINK) &&
+            ((p_mac_lte_info->rntiType == C_RNTI) ||
+             (p_mac_lte_info->rntiType == SI_RNTI) ||
+             (p_mac_lte_info->rntiType == P_RNTI))) {
+
+            p_mac_lte_info->crcStatusValid = TRUE;
+            p_mac_lte_info->crcStatus = outhdr_values[i++];
+        }
+        else {
+            i++;
+        }
     }
 
-
     /* Store info in packet */
     p_add_proto_data(pinfo->fd, proto_mac_lte, p_mac_lte_info);
 }
diff --git a/epan/dissectors/packet-mac-lte.c b/epan/dissectors/packet-mac-lte.c
index 2200cc218a..631edeb3c9 100644
--- a/epan/dissectors/packet-mac-lte.c
+++ b/epan/dissectors/packet-mac-lte.c
@@ -1066,23 +1066,26 @@ void dissect_mac_lte(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
         }
     }
 
-    ti = proto_tree_add_uint(mac_lte_tree, hf_mac_lte_context_crc_status,
-                             tvb, 0, 0, p_mac_lte_info->crcStatus);
-    PROTO_ITEM_SET_GENERATED(ti);
-    if (p_mac_lte_info->crcStatus != TRUE) {
-        expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_ERROR,
-                               "Frame has CRC error");
-        if (check_col(pinfo->cinfo, COL_INFO)) {
-            col_append_fstr(pinfo->cinfo, COL_INFO, "<CRC FAILURE>");
+    if (p_mac_lte_info->crcStatusValid) {
+        ti = proto_tree_add_uint(mac_lte_tree, hf_mac_lte_context_crc_status,
+                                 tvb, 0, 0, p_mac_lte_info->crcStatus);
+        PROTO_ITEM_SET_GENERATED(ti);
+        if (p_mac_lte_info->crcStatus != TRUE) {
+            expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_ERROR,
+                                   "Frame has CRC error");
+            if (check_col(pinfo->cinfo, COL_INFO)) {
+                col_append_fstr(pinfo->cinfo, COL_INFO, "<CRC FAILURE>");
+            }
         }
     }
 
 
     /* Set context-info parts of tap struct */
     tap_info.rnti = p_mac_lte_info->rnti;
-    tap_info.rnti_type = p_mac_lte_info->rntiType;
-    tap_info.is_predefined_data = p_mac_lte_info->isPredefinedData;
+    tap_info.rntiType = p_mac_lte_info->rntiType;
+    tap_info.isPredefinedData = p_mac_lte_info->isPredefinedData;
     tap_info.reTxCount = p_mac_lte_info->reTxCount;
+    tap_info.crcStatusValid = p_mac_lte_info->crcStatusValid;
     tap_info.crcStatus = p_mac_lte_info->crcStatus;
     tap_info.direction = p_mac_lte_info->direction;
 
diff --git a/epan/dissectors/packet-mac-lte.h b/epan/dissectors/packet-mac-lte.h
index 56df48b67f..21d807ee04 100644
--- a/epan/dissectors/packet-mac-lte.h
+++ b/epan/dissectors/packet-mac-lte.h
@@ -53,6 +53,7 @@ typedef struct mac_lte_info
     guint8          isPredefinedData;
     guint16         length;
     guint8          reTxCount;
+    guint8          crcStatusValid;
     guint8          crcStatus;
 } mac_lte_info;
 
@@ -60,9 +61,10 @@ typedef struct mac_lte_info
 typedef struct mac_lte_tap_info {
     /* Info from context */
     guint16  rnti;
-    guint8   rnti_type;
-    guint8   is_predefined_data;
+    guint8   rntiType;
+    guint8   isPredefinedData;
     guint8   reTxCount;
+    guint8   crcStatusValid;
     guint8   crcStatus;
     guint8   direction;