From f053fb84ef2b9673f9e7932f25f37e9944a04bd9 Mon Sep 17 00:00:00 2001
From: Fabian Ebner <f.ebner@proxmox.com>
Date: Thu, 18 Feb 2021 13:47:43 +0100
Subject: [PATCH] array: avoid underflow when array is empty and more is zero

serializing an empty array triggered this.

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
[rustfmt: Wolfgang Bumiller <w.bumiller@proxmox.com>]
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
 perlmod/src/array.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/perlmod/src/array.rs b/perlmod/src/array.rs
index ce6e112..895fcdf 100644
--- a/perlmod/src/array.rs
+++ b/perlmod/src/array.rs
@@ -102,6 +102,9 @@ impl Array {
 
     /// Pre-extend the array to up to the specified length..
     pub fn reserve(&self, more: usize) {
+        if more == 0 {
+            return;
+        }
         let idx = self.len() + more - 1;
         unsafe {
             ffi::RSPL_av_extend(self.av(), idx as libc::ssize_t);