From 43a67970b6c17f8d0525f90fac25923cd4a989bf Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Sat, 23 May 2020 03:49:46 +0200
Subject: af_scaletempo: fix theoretical UB

Passing NULL to memset() is undefined behavior, even if the size
argument is 0. Could happen on init errors and such.
---
 audio/filter/af_scaletempo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/audio/filter/af_scaletempo.c b/audio/filter/af_scaletempo.c
index 911fd8914e..b1ee790189 100644
--- a/audio/filter/af_scaletempo.c
+++ b/audio/filter/af_scaletempo.c
@@ -538,7 +538,8 @@ static void reset(struct mp_filter *f)
     s->bytes_queued = 0;
     s->bytes_to_slide = 0;
     s->frames_stride_error = 0;
-    memset(s->buf_overlap, 0, s->bytes_overlap);
+    if (s->buf_overlap && s->bytes_overlap)
+        memset(s->buf_overlap, 0, s->bytes_overlap);
     TA_FREEP(&s->in);
 }
 
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