CRED: Wrap current->cred and a few other accessors

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / tun.c

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index b14e2025e22170d20d3e4c24482bceea0f284a75..55dc70c6b4db093cc5c021bdd722cf59b4873888 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -702,6 +702,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
        struct tun_net *tn;
        struct tun_struct *tun;
        struct net_device *dev;
+       const struct cred *cred = current_cred();
        int err;
 
        tn = net_generic(net, tun_net_id);
@@ -712,11 +713,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 
                /* Check permissions */
                if (((tun->owner != -1 &&
-                     current_euid() != tun->owner) ||
+                     cred->euid != tun->owner) ||
                     (tun->group != -1 &&
-                     current_egid() != tun->group)) &&
-                    !capable(CAP_NET_ADMIN))
+                     cred->egid != tun->group)) &&
+                   !capable(CAP_NET_ADMIN)) {
                        return -EPERM;
+               }
        }
        else if (__dev_get_by_name(net, ifr->ifr_name))
                return -EINVAL;