From 3f562ee5861fe194316c05b95aa624b74ce630da Mon Sep 17 00:00:00 2001
From: Nikos Mavrogiannopoulos <nmav@redhat.com>
Date: Wed, 18 Apr 2018 09:09:05 +0200
Subject: [PATCH] buffer: Do not call explicit_bzero with null arguments

This allows compiling and testing with undefined sanitizer.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
---
 src/buffer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/buffer.c b/src/buffer.c
index 89fd0f6d..7001eef0 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -195,7 +195,9 @@ static void buffer_shift(ssh_buffer buffer){
 int ssh_buffer_reinit(struct ssh_buffer_struct *buffer)
 {
     buffer_verify(buffer);
-    explicit_bzero(buffer->data, buffer->used);
+    if (buffer->used > 0) {
+        explicit_bzero(buffer->data, buffer->used);
+    }
     buffer->used = 0;
     buffer->pos = 0;