avformat/nuv: Check channels

Fixes: signed integer overflow: -3468545475927866368 * 4 cannot be represented in type 'long'
Fixes: 28879/clusterfuzz-testcase-minimized-ffmpeg_dem_NUV_fuzzer-6303367307591680
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavformat/nuv.c b/libavformat/nuv.c
index d99770d41d81030303f7c67563ed3b912eaf1ba9..df90df49385278e845b378e8b6084c1ad012961d 100644 (file)
--- a/libavformat/nuv.c
+++ b/libavformat/nuv.c
@@ -117,6 +117,10 @@ static int get_codec_data(AVFormatContext *s, AVIOContext *pb, AVStream *vst,
                 ast->codecpar->bits_per_coded_sample = avio_rl32(pb);
                 ast->codecpar->channels              = avio_rl32(pb);
                 ast->codecpar->channel_layout        = 0;
+                if (ast->codecpar->channels <= 0) {
+                    av_log(s, AV_LOG_ERROR, "Invalid channels %d\n", ast->codecpar->channels);
+                    return AVERROR_INVALIDDATA;
+                }
 
                 id = ff_wav_codec_get_id(ast->codecpar->codec_tag,
                                          ast->codecpar->bits_per_coded_sample);