conf/ile: get ip prefix via lxc_safe_uint()

src/lxc/conf.h

@@ -62,7 +62,7 @@ enum {
 struct lxc_inetdev {
 	struct in_addr addr;
 	struct in_addr bcast;
-	int prefix;
+	unsigned int prefix;
 };
 
 struct lxc_route {
@@ -80,7 +80,7 @@ struct lxc_inet6dev {
 	struct in6_addr addr;
 	struct in6_addr mcast;
 	struct in6_addr acast;
-	int prefix;
+	unsigned int prefix;
 };
 
 struct lxc_route6 {

src/lxc/confile.c

@@ -848,8 +848,12 @@ static int config_network_ipv4(const char *key, const char *value,
 	}
 
 	/* no prefix specified, determine it from the network class */
-	inetdev->prefix = prefix ? atoi(prefix) :
-		config_ip_prefix(&inetdev->addr);
+	if (prefix) {
+		if (lxc_safe_uint(prefix, &inetdev->prefix) < 0)
+			return -1;
+	} else {
+		inetdev->prefix = config_ip_prefix(&inetdev->addr);
+	}
 
 	/* if no broadcast address, let compute one from the
 	 * prefix and address
@@ -947,7 +951,8 @@ static int config_network_ipv6(const char *key, const char *value,
 	if (slash) {
 		*slash = '\0';
 		netmask = slash + 1;
-		inet6dev->prefix = atoi(netmask);
+		if (lxc_safe_uint(netmask, &inet6dev->prefix) < 0)
+			return -1;
 	}
 
 	if (!inet_pton(AF_INET6, valdup, &inet6dev->addr)) {