demux: ts: prevent unwanted read at end of media

Truncated packets at the end

modules/demux/ts.c

@@ -460,6 +460,7 @@ static void SetPrgFilter( demux_t *, int i_prg, bool b_selected );
 #define TS_PACKET_SIZE_192 192
 #define TS_PACKET_SIZE_204 204
 #define TS_PACKET_SIZE_MAX 204
+#define TS_HEADER_SIZE 4
 
 static int DetectPacketSize( demux_t *p_demux, int *pi_header_size, int i_offset )
 {
@@ -2409,6 +2410,12 @@ static block_t* ReadTSPacket( demux_t *p_demux )
         return NULL;
     }
 
+    if( p_pkt->i_buffer < TS_HEADER_SIZE + p_sys->i_packet_header_size )
+    {
+        block_Release( p_pkt );
+        return NULL;
+    }
+
     /* Skip header (BluRay streams).
      * re-sync logic would do this (by adjusting packet start), but this would result in losing first and last ts packets.
      * First packet is usually PAT, and losing it means losing whole first GOP. This is fatal with still-image based menus.