From a212a983c7f4faf06e600f32a165592dc5b6ae76 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Thu, 3 Sep 2015 14:52:18 +0200
Subject: [PATCH] avfilter/avf_showwaves: Check max_samples

Fixes potential division by zero
Fixes: CID1292295

Reviewed-by: Ganesh Ajjanagadde <gajjanag@mit.edu>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavfilter/avf_showwaves.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavfilter/avf_showwaves.c b/libavfilter/avf_showwaves.c
index 57a6b2e149..a19acf54b9 100644
--- a/libavfilter/avf_showwaves.c
+++ b/libavfilter/avf_showwaves.c
@@ -203,6 +203,11 @@ static int push_single_pic(AVFilterLink *outlink)
     int col = 0;
     int64_t *sum = showwaves->sum;
 
+    if (max_samples == 0) {
+        av_log(ctx, AV_LOG_ERROR, "Too few samples\n");
+        return AVERROR(EINVAL);
+    }
+
     av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", max_samples);
 
     memset(sum, 0, nb_channels);