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diff -r 55f3224d7513 media/libtremor/lib/tremor_synthesis.c
--- a/media/libtremor/lib/tremor_synthesis.c	Sat Jan 03 20:02:33 2015 -0800
+++ b/media/libtremor/lib/tremor_synthesis.c	Sun Jan 04 11:17:29 2015 -0800
@@ -119,13 +119,13 @@ long vorbis_packet_blocksize(vorbis_info
     while(v>1){
       modebits++;
       v>>=1;
     }
 
     /* read our mode and pre/post windowsize */
     mode=oggpack_read(&opb,modebits);
   }
-  if(mode==-1)return(OV_EBADPACKET);
+  if(mode==-1 || !ci->mode_param[mode])return(OV_EBADPACKET);
   return(ci->blocksizes[ci->mode_param[mode]->blockflag]);
 }