From 98c1e37d860129450619a589cf5aa8075f4e0d38 Mon Sep 17 00:00:00 2001
From: Martijn Dekker <martijn@inlv.org>
Date: Sun, 7 Jun 2020 20:41:04 +0200
Subject: [PATCH] Fix memory corruption while parsing functions

Discussion: https://bugzilla.redhat.com/show_bug.cgi?id=1451057

src/cmd/ksh93/sh/parse.c: funct():
- Make the savstak variable volatile and always initialise it to
  avoid undefined behaviour.

(cherry picked from commit 5e56b28cd63ec2120c5f70a6e0abf2f8dbb7e7dc)
---
 src/cmd/ksh93/sh/parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cmd/ksh93/sh/parse.c b/src/cmd/ksh93/sh/parse.c
index 7f259bc86..e7222c0f9 100644
--- a/src/cmd/ksh93/sh/parse.c
+++ b/src/cmd/ksh93/sh/parse.c
@@ -742,7 +742,7 @@ static Shnode_t *funct(Lex_t *lexp)
 	register Shnode_t *t;
 	register int flag;
 	struct slnod *volatile slp=0;
-	Stak_t *savstak;
+	Stak_t *volatile savstak=0;
 	Sfoff_t	first, last;
 	struct functnod *volatile fp;
 	Sfio_t *iop;