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[06/10] tun: Make tun_net_xmit atomic wrt tun_attach && tun_detach

Message ID m11vuxlmhn.fsf_-_@fess.ebiederm.org
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Eric W. Biederman Jan. 20, 2009, 9:02 p.m. UTC 
Currently this small race allows for a packet to be received when we
detach from an tun device and still be enqueued.  Not especially
important but not what the code is trying to do.

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
---
 drivers/net/tun.c |   24 +++++++++++++++++-------
 1 files changed, 17 insertions(+), 7 deletions(-)
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Patch

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index dfbf586..fa93160 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -115,25 +115,33 @@  static int tun_attach(struct tun_struct *tun, struct file *file)
 {
 	struct tun_file *tfile = file->private_data;
 	const struct cred *cred = current_cred();
+	int err;
 
 	ASSERT_RTNL();
 
-	if (tfile->tun)
-		return -EINVAL;
-
-	if (tun->tfile)
-		return -EBUSY;
-
 	/* Check permissions */
 	if (((tun->owner != -1 && cred->euid != tun->owner) ||
 	     (tun->group != -1 && cred->egid != tun->group)) &&
 		!capable(CAP_NET_ADMIN))
 		return -EPERM;
 
+	netif_tx_lock_bh(tun->dev);
+
+	err = -EINVAL;
+	if (tfile->tun)
+		goto out;
+
+	err = -EBUSY;
+	if (tun->tfile)
+		goto out;
+
+	err = 0;
 	tfile->tun = tun;
 	tun->tfile = tfile;
 
-	return 0;
+out:
+	netif_tx_unlock_bh(tun->dev);
+	return err;
 }
 
 static void __tun_detach(struct tun_struct *tun)
@@ -141,8 +149,10 @@  static void __tun_detach(struct tun_struct *tun)
 	struct tun_file *tfile = tun->tfile;
 
 	/* Detach from net device */
+	netif_tx_lock_bh(tun->dev);
 	tfile->tun = NULL;
 	tun->tfile = NULL;
+	netif_tx_unlock_bh(tun->dev);
 
 	/* Drop read queue */
 	skb_queue_purge(&tun->readq);