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path: root/drivers/net/tun.c
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Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index a4fdad475594..18656c4094b3 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -856,10 +856,6 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
err = 0;
}
- rcu_assign_pointer(tfile->tun, tun);
- rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile);
- tun->numqueues++;
-
if (tfile->detached) {
tun_enable_queue(tfile);
} else {
@@ -876,6 +872,13 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
* refcnt.
*/
+ /* Publish tfile->tun and tun->tfiles only after we've fully
+ * initialized tfile; otherwise we risk using half-initialized
+ * object.
+ */
+ rcu_assign_pointer(tfile->tun, tun);
+ rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile);
+ tun->numqueues++;
out:
return err;
}