avformat/adxdec: check avctx->channels for invalid values

This avoids a null pointer dereference of pkt->data.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavformat/adxdec.c b/libavformat/adxdec.c
index e57d051..e7107ac 100644
--- a/libavformat/adxdec.c
+++ b/libavformat/adxdec.c
@@ -40,6 +40,11 @@ static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
     AVCodecContext *avctx = s->streams[0]->codec;
     int ret, size;
 
+    if (avctx->channels <= 0) {
+        av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
+        return AVERROR_INVALIDDATA;
+    }
+
     size = BLOCK_SIZE * avctx->channels;
 
     pkt->pos = avio_tell(s->pb);