From 981fbfc16220a15e72457d8ece4e014988746946 Mon Sep 17 00:00:00 2001
From: Karl Williamson <khw@cpan.org>
Date: Thu, 12 Mar 2020 12:48:47 -0600
Subject: [PATCH] reentr.c: Prevent infinite looping
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This is an easy, though  paranoid hedge to prevent something that should
never happen from causing an infinite loop if it were to happen.

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 reentr.c        | 2 +-
 regen/reentr.pl | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/reentr.c b/reentr.c
index 8438c8f90f..2429aa2f5d 100644
--- a/reentr.c
+++ b/reentr.c
@@ -36,7 +36,7 @@
 
 #define RenewDouble(data_pointer, size_pointer, type) \
     STMT_START { \
-	const size_t size = *(size_pointer) * 2; \
+	const size_t size = MAX(*(size_pointer), 1) * 2; \
 	Renew((data_pointer), (size), type); \
 	*(size_pointer) = size; \
     } STMT_END
diff --git a/regen/reentr.pl b/regen/reentr.pl
index 94721e9dec..ba2e1c8fa6 100644
--- a/regen/reentr.pl
+++ b/regen/reentr.pl
@@ -818,7 +818,7 @@ print $c <<"EOF";
 
 #define RenewDouble(data_pointer, size_pointer, type) \\
     STMT_START { \\
-	const size_t size = *(size_pointer) * 2; \\
+	const size_t size = MAX(*(size_pointer), 1) * 2; \\
 	Renew((data_pointer), (size), type); \\
 	*(size_pointer) = size; \\
     } STMT_END
-- 
2.25.4