fixed, validate extradata before dereferencing it

diff --git a/xbmc/cores/dvdplayer/DVDCodecs/Video/DVDVideoCodecAmlogic.cpp b/xbmc/cores/dvdplayer/DVDCodecs/Video/DVDVideoCodecAmlogic.cpp
index 200bcb5..edbc45d 100644 (file)
--- a/xbmc/cores/dvdplayer/DVDCodecs/Video/DVDVideoCodecAmlogic.cpp
+++ b/xbmc/cores/dvdplayer/DVDCodecs/Video/DVDVideoCodecAmlogic.cpp
@@ -86,7 +86,7 @@ bool CDVDVideoCodecAmlogic::Open(CDVDStreamInfo &hints, CDVDCodecOptions &option
       m_pFormatName = "am-h264";
       // convert h264-avcC to h264-annex-b as h264-avcC
       // under streamers can have issues when seeking.
-      if (*(uint8_t*)m_hints.extradata == 1)
+      if (m_hints.extradata && *(uint8_t*)m_hints.extradata == 1)
       {
         m_bitstream = new CBitstreamConverter;
         m_bitstream->Open(m_hints.codec, (uint8_t*)m_hints.extradata, m_hints.extrasize, true);