From e11bb2b868940d9390510b8b7bbd482f74f4baa7 Mon Sep 17 00:00:00 2001
From: Tatsuya Kinoshita <tats@debian.org>
Date: Thu, 4 Mar 2021 22:18:03 +0900
Subject: Consider Strgrow overflow in Strinsert_char

---
 Str.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Str.c b/Str.c
index ab8e4bd..b4f1360 100644
--- a/Str.c
+++ b/Str.c
@@ -348,10 +348,12 @@ Strinsert_char(Str s, int pos, char c)
 {
     int i;
     STR_LENGTH_CHECK(s);
-    if (pos < 0 || s->length < pos)
+    if (pos < 0)
 	return;
     if (s->length + 2 > s->area_size)
 	Strgrow(s);
+    if (s->length < pos)
+	return;
     for (i = s->length; i > pos; i--)
 	s->ptr[i] = s->ptr[i - 1];
     s->ptr[++s->length] = '\0';
-- 
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