dev_ioctl(): move copyin/copyout to callers
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index d262f15..0ab1af0 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -18,26 +18,10 @@
* match. --pb
*/
-static int dev_ifname(struct net *net, struct ifreq __user *arg)
+static int dev_ifname(struct net *net, struct ifreq *ifr)
{
- struct ifreq ifr;
- int error;
-
- /*
- * Fetch the caller's info block.
- */
-
- if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
- return -EFAULT;
- ifr.ifr_name[IFNAMSIZ-1] = 0;
-
- error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
- if (error)
- return error;
-
- if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
- return -EFAULT;
- return 0;
+ ifr->ifr_name[IFNAMSIZ-1] = 0;
+ return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
}
static gifconf_func_t *gifconf_list[NPROTO];
@@ -402,24 +386,24 @@
* positive or a negative errno code on error.
*/
-int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
+int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
{
- struct ifreq ifr;
int ret;
char *colon;
+ if (need_copyout)
+ *need_copyout = true;
if (cmd == SIOCGIFNAME)
- return dev_ifname(net, (struct ifreq __user *)arg);
+ return dev_ifname(net, ifr);
- if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
- return -EFAULT;
+ ifr->ifr_name[IFNAMSIZ-1] = 0;
- ifr.ifr_name[IFNAMSIZ-1] = 0;
-
- colon = strchr(ifr.ifr_name, ':');
+ colon = strchr(ifr->ifr_name, ':');
if (colon)
*colon = 0;
+ dev_load(net, ifr->ifr_name);
+
/*
* See which interface the caller is talking about.
*/
@@ -439,31 +423,19 @@
case SIOCGIFMAP:
case SIOCGIFINDEX:
case SIOCGIFTXQLEN:
- dev_load(net, ifr.ifr_name);
rcu_read_lock();
- ret = dev_ifsioc_locked(net, &ifr, cmd);
+ ret = dev_ifsioc_locked(net, ifr, cmd);
rcu_read_unlock();
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- }
+ if (colon)
+ *colon = ':';
return ret;
case SIOCETHTOOL:
- dev_load(net, ifr.ifr_name);
rtnl_lock();
- ret = dev_ethtool(net, &ifr);
+ ret = dev_ethtool(net, ifr);
rtnl_unlock();
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- }
+ if (colon)
+ *colon = ':';
return ret;
/*
@@ -477,17 +449,11 @@
case SIOCSIFNAME:
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
- dev_load(net, ifr.ifr_name);
rtnl_lock();
- ret = dev_ifsioc(net, &ifr, cmd);
+ ret = dev_ifsioc(net, ifr, cmd);
rtnl_unlock();
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- }
+ if (colon)
+ *colon = ':';
return ret;
/*
@@ -528,10 +494,11 @@
/* fall through */
case SIOCBONDSLAVEINFOQUERY:
case SIOCBONDINFOQUERY:
- dev_load(net, ifr.ifr_name);
rtnl_lock();
- ret = dev_ifsioc(net, &ifr, cmd);
+ ret = dev_ifsioc(net, ifr, cmd);
rtnl_unlock();
+ if (need_copyout)
+ *need_copyout = false;
return ret;
case SIOCGIFMEM:
@@ -551,13 +518,9 @@
cmd == SIOCGHWTSTAMP ||
(cmd >= SIOCDEVPRIVATE &&
cmd <= SIOCDEVPRIVATE + 15)) {
- dev_load(net, ifr.ifr_name);
rtnl_lock();
- ret = dev_ifsioc(net, &ifr, cmd);
+ ret = dev_ifsioc(net, ifr, cmd);
rtnl_unlock();
- if (!ret && copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
return ret;
}
return -ENOTTY;