10l, protect malloc overflow

Originally committed as revision 12205 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/aiff.c

@@ -368,6 +368,8 @@ static int aiff_read_header(AVFormatContext *s,
             url_fskip(pb, size - 8);
             break;
         case MKTAG('w', 'a', 'v', 'e'):
+            if ((uint64_t)size > (1<<30))
+                return -1;
             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codec->extradata)
                 return AVERROR(ENOMEM);