From: Rafael Garcia-Suarez <rgs@consttype.org>
Date: Wed, 31 Mar 2010 07:50:00 +0000 (+0200)
Subject: Avoid a segfault when reversing an empty array in-place.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=572558b47236782e60e41bd235c96eae7cbca3db;p=p5sagit%2Fp5-mst-13.2.git

Avoid a segfault when reversing an empty array in-place.
---

diff --git a/pp.c b/pp.c
index 5876cfd..daa63af 100644
--- a/pp.c
+++ b/pp.c
@@ -5420,7 +5420,7 @@ PP(pp_reverse)
 		SV **begin = AvARRAY(av);
 		SV **end   = begin + AvFILLp(av);
 
-		while (begin < end) {
+		while (begin && begin < end) {
 		    register SV * const tmp = *begin;
 		    *begin++ = *end;
 		    *end--   = tmp;