xmalloc: Add and use xcalloc

Add a wrapper for calloc which checks for integer overflows in the
calculation of the size to allocate.

Use xcalloc to allocate an array of objects instead of calculating the
size ourselves, which might cause an integer overflow.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 51eb627..88d59bf 100644
--- a/hash.c
+++ b/hash.c
@@ -94,7 +94,7 @@ static void grow_hash_table(struct hash_table *table)
 	struct hash_table_entry *old_array = table->array, *new_array;
 
 	new_size = alloc_nr(old_size);
-	new_array = xzmalloc(sizeof(struct hash_table_entry) * new_size);
+	new_array = xcalloc(new_size, sizeof(struct hash_table_entry));
 
 	table->size = new_size;
 	table->array = new_array;