[FFmpeg-cvslog] avfilter/af_pan: fix null pointer dereference on empty token

[Marton Balint]

ffmpeg | branch: master | Marton Balint <cus at passwd.hu> | Sun Feb  5 02:25:04 2017 +0100| [e57fd926b09156fd8da42876e8946490025c47d4] | committer: Marton Balint

avfilter/af_pan: fix null pointer dereference on empty token

Fixes Coverity CID 1396254.

Signed-off-by: Marton Balint <cus at passwd.hu>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e57fd926b09156fd8da42876e8946490025c47d4
---

 libavfilter/af_pan.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavfilter/af_pan.c b/libavfilter/af_pan.c
index 94f1587..a477bde 100644
--- a/libavfilter/af_pan.c
+++ b/libavfilter/af_pan.c
@@ -115,6 +115,11 @@ static av_cold int init(AVFilterContext *ctx)
     if (!args)
         return AVERROR(ENOMEM);
     arg = av_strtok(args, "|", &tokenizer);
+    if (!arg) {
+        av_log(ctx, AV_LOG_ERROR, "Channel layout not specified\n");
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
     ret = ff_parse_channel_layout(&pan->out_channel_layout,
                                   &pan->nb_output_channels, arg, ctx);
     if (ret < 0)