Merge commit '7c51d79c'

* commit '7c51d79c':
  nsvdec: validate channels and samplerate

See: d633e15dMerged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/nsvdec.c

@@ -621,6 +621,8 @@ null_chunk_retry:
             bps = avio_r8(pb);
             channels = avio_r8(pb);
             samplerate = avio_rl16(pb);
+            if (!channels || !samplerate)
+                return AVERROR_INVALIDDATA;
             asize-=4;
             av_dlog(s, "NSV RAWAUDIO: bps %d, nchan %d, srate %d\n", bps, channels, samplerate);
             if (fill_header) {