From 638eec2ac34b7f65a8e84203ea4292440bc8fe50 Mon Sep 17 00:00:00 2001
From: Nicolas George <george@nsup.org>
Date: Sun, 3 Aug 2014 20:39:59 +0200
Subject: [PATCH] lavfi/avf_showspectrum: check RDFT context init.

Fix a segfault with large window size.
---
 libavfilter/avf_showspectrum.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavfilter/avf_showspectrum.c b/libavfilter/avf_showspectrum.c
index 9130f6f4ab..bd4d818d6b 100644
--- a/libavfilter/avf_showspectrum.c
+++ b/libavfilter/avf_showspectrum.c
@@ -177,6 +177,11 @@ static int config_output(AVFilterLink *outlink)
 
         av_rdft_end(s->rdft);
         s->rdft = av_rdft_init(rdft_bits, DFT_R2C);
+        if (!s->rdft) {
+            av_log(ctx, AV_LOG_ERROR, "Unable to create RDFT context. "
+                   "The window size might be too high.\n");
+            return AVERROR(EINVAL);
+        }
         s->rdft_bits = rdft_bits;
 
         /* RDFT buffers: x2 for each (display) channel buffer.