From 1bfa46a45617d7ddb1403900a0f8f53158aac66a Mon Sep 17 00:00:00 2001
From: Andres Amaya Garcia <andres.amayagarcia@arm.com>
Date: Wed, 12 Jul 2017 11:00:02 +0100
Subject: [PATCH] Zeroize tmp buffer in entropy_update()

---
 library/entropy.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/library/entropy.c b/library/entropy.c
index caff22f42..5a8321b8d 100644
--- a/library/entropy.c
+++ b/library/entropy.c
@@ -166,6 +166,8 @@ static int entropy_update( entropy_context *ctx, unsigned char source_id,
     sha256_update( &ctx->accumulator, p, use_len );
 #endif
 
+    polarssl_zeroize( tmp, sizeof( tmp ) );
+
     return( 0 );
 }