Fix crash on corrupt input file (invalid mode index)

[platform/upstream/libvorbis.git] / lib / synthesis.c

diff --git a/lib/synthesis.c b/lib/synthesis.c
index 6ed554d..0f2df63 100644 (file)
--- a/lib/synthesis.c
+++ b/lib/synthesis.c
@@ -164,7 +164,7 @@ long vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op){
     /* 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]);
 }