From 8e1e46ebb505e6973860839e4dee8e89f575ee1f Mon Sep 17 00:00:00 2001
From: Gilles Peskine <Gilles.Peskine@arm.com>
Date: Mon, 8 Feb 2021 22:02:12 +0100
Subject: [PATCH] Fix the use of unitialized memory with
 MBEDTLS_TEST_NULL_ENTROPY

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
---
 library/entropy_poll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index 5250a7bfec..27465f27d3 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -205,13 +205,13 @@ int mbedtls_null_entropy_poll( void *data,
 {
     ((void) data);
     ((void) output);
-    *olen = 0;
 
+    *olen = 0;
     if( len < sizeof(unsigned char) )
         return( 0 );
 
+    output[0] = 0;
     *olen = sizeof(unsigned char);
-
     return( 0 );
 }
 #endif