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Prevent division by zero in linkhash.

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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.
This commit is contained in:
Tobias Stoeckmann
2020-05-04 19:46:45 +02:00
parent 099016b7e8
commit 77d935b7ae
1 changed files with 3 additions and 0 deletions
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3
linkhash.c
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@@ -12,6 +12,7 @@
#include "config.h" #include "config.h"
#include <assert.h>
#include <limits.h> #include <limits.h>
#include <stdarg.h> #include <stdarg.h>
#include <stddef.h> #include <stddef.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; int i;
struct lh_table *t; 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)); t = (struct lh_table *)calloc(1, sizeof(struct lh_table));
if (!t) if (!t)
return NULL; return NULL;