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From 77d935b7ae7871a1940cd827e850e6063044ec45 Mon Sep 17 00:00:00 2001
From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Mon, 4 May 2020 19:46:45 +0200
Subject: [PATCH] Prevent division by zero in linkhash.
If a linkhash with a size of zero is created, then modulo operations
are prone to division by zero operations.
Purely protective measure against bad usage.
---
linkhash.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/linkhash.c b/linkhash.c
index 7ea58c0abf..f05cc38030 100644
--- a/linkhash.c
+++ b/linkhash.c
@@ -12,6 +12,7 @@
#include "config.h"
+#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
@@ -499,6 +500,8 @@ struct lh_table *lh_table_new(int size, lh_entry_free_fn *free_fn, lh_hash_fn *h
int i;
struct lh_table *t;
+ /* Allocate space for elements to avoid divisions by zero. */
+ assert(size > 0);
t = (struct lh_table*)calloc(1, sizeof(struct lh_table));
if (!t)
return NULL;
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