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, 2 insertions, 1 deletions

diff --git a/cpusched.c b/cpusched.c
index 2b4260b..26c0771 100644
--- a/cpusched.c
+++ b/cpusched.c
@@ -140,7 +140,8 @@ static int cleanup_cpusched_batch(void *ptr)
 void init_cpusched(unsigned int cpus)
 {
 	rwlock_init(&map_lock);
-	cpu_work_map = xzmalloc((cpu_len = cpus) * sizeof(*cpu_work_map));
+	cpu_len = cpus;
+	cpu_work_map = xcalloc(cpu_len, sizeof(*cpu_work_map));
 	init_hash(&mapper);
 }