From 89c2d22076b8d09c340b0ae4c6b9811b23c06973 Mon Sep 17 00:00:00 2001
From: Tom <tomganzka@gmail.com>
Date: Mon, 16 Jan 2023 11:27:54 +0100
Subject: [PATCH] Fixing UB in hsearch

Referenced by issue: https://github.com/tinyproxy/tinyproxy/issues/470
---
 src/hsearch.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/hsearch.c b/src/hsearch.c
index be0434c..f7a9b00 100644
--- a/src/hsearch.c
+++ b/src/hsearch.c
@@ -82,7 +82,13 @@ static int resize(struct htab *htab, size_t nel)
 	size_t i, j;
 	struct elem *e, *newe;
 	struct elem *oldtab = htab->elems;
-	struct elem *oldend = htab->elems + htab->mask + 1;
+	size_t offset = 1;
+	if (htab->elems)
+		offset += htab->elems;
+	if (htab->mask)
+		offset += htab->mask;
+	
+	struct elem *oldend = offset;
 
 	if (nel > MAXSIZE)
 		nel = MAXSIZE;