dr_58: add boundary checking

src/descriptors/dr_58.c

@@ -84,7 +84,12 @@ dvbpsi_local_time_offset_dr_t * dvbpsi_DecodeLocalTimeOffsetDr(
         p_current->i_next_time_offset           =   ((uint16_t)p_data[11] << 8)
                 |  (uint16_t)p_data[12];
 
+        /* NOTE: Only decode upto DVBPSI_LOCAL_TIME_OFFSET_DR_MAX number of time
+           offsets. The decoding struct cannot hold more then that. */
         p_decoded->i_local_time_offsets_number++;
+        if (p_decoded->i_local_time_offsets_number == DVBPSI_LOCAL_TIME_OFFSET_DR_MAX)
+            break;
+
         p_data += 13;
         p_current++;
     }
@@ -101,6 +106,9 @@ dvbpsi_descriptor_t * dvbpsi_GenLocalTimeOffsetDr(
                                         dvbpsi_local_time_offset_dr_t * p_decoded,
                                         bool b_duplicate)
 {
+    if (p_decoded->i_local_time_offsets_number > DVBPSI_LOCAL_TIME_OFFSET_DR_MAX)
+        p_decoded->i_local_time_offsets_number = DVBPSI_LOCAL_TIME_OFFSET_DR_MAX;
+
     /* Create the descriptor */
     dvbpsi_descriptor_t * p_descriptor =
             dvbpsi_NewDescriptor(0x58, p_decoded->i_local_time_offsets_number * 13, NULL);

src/descriptors/dr_58.h

@@ -65,6 +65,12 @@ typedef struct dvbpsi_local_time_offset_s
 
 } dvbpsi_local_time_offset_t;
 
+/*!
+ * \def DVBPSI_LOCAL_TIME_OFFSET_DR_MAX
+ * \brief Maximum number of dvbpsi_local_time_offset_t entries present in
+ * @see dvbpsi_local_time_offset_dr_t
+ */
+#define DVBPSI_LOCAL_TIME_OFFSET_DR_MAX 19
 
 /*****************************************************************************
  * dvbpsi_local_time_offset_dr_t
@@ -83,11 +89,11 @@ typedef struct dvbpsi_local_time_offset_s
 typedef struct dvbpsi_local_time_offset_dr_s
 {
   uint8_t      i_local_time_offsets_number;             /*!< local time offset number */
-  dvbpsi_local_time_offset_t p_local_time_offset[19];   /*!< local time offset */
+  dvbpsi_local_time_offset_t
+               p_local_time_offset[DVBPSI_LOCAL_TIME_OFFSET_DR_MAX]; /*!< local time offset */
 
 } dvbpsi_local_time_offset_dr_t;
 
-
 /*****************************************************************************
  * dvbpsi_DecodeLocalTimeOffsetDr
  *****************************************************************************/