From ea0963181a2cc8e42a0c58da96fb7fed5e857e5b Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Wed, 7 Mar 2018 21:36:12 +0100
Subject: [PATCH] avfilter/af_alimiter: check if buffer_size is valid

Fixes #7050.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavfilter/af_alimiter.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavfilter/af_alimiter.c b/libavfilter/af_alimiter.c
index 0fc8e6baa3..c41e95576f 100644
--- a/libavfilter/af_alimiter.c
+++ b/libavfilter/af_alimiter.c
@@ -327,6 +327,11 @@ static int config_input(AVFilterLink *inlink)
     s->buffer_size = inlink->sample_rate * s->attack * inlink->channels;
     s->buffer_size -= s->buffer_size % inlink->channels;
 
+    if (s->buffer_size <= 0) {
+        av_log(ctx, AV_LOG_ERROR, "Attack is too small.\n");
+        return AVERROR(EINVAL);
+    }
+
     return 0;
 }