Use strtol() instead of atoi()

Code cleanup patch.  Use strtol() to convert strings to
ints, rather than atoi().  No error checking capability
with atoi().  Also add error handling to detect strtol
failures.

1 files changed, 7 insertions, 1 deletions

diff --git a/isys/isys.c b/isys/isys.c
index d1798d566..e2b40cb87 100644
--- a/isys/isys.c
+++ b/isys/isys.c
@@ -548,7 +548,13 @@ static PyObject * doConfigNetDevice(PyObject * s, PyObject * args) {
         cfg.ipv6 = ip_addr_in6(&addr6);
 
         if (strlen(prefix))
-            i = atoi(prefix);
+            i = strtol(prefix, NULL, 10);
+
+            if ((errno == ERANGE && (i == LONG_MIN || i == LONG_MAX)) ||
+                (errno != 0 && i == 0)) {
+                return NULL;
+            }
+
             if (i > 0 && i <= 128)
                 cfg.ipv6_prefixlen = i;
     }