This is a note to let you know that I've just added the patch titled
dlci: acquire rtnl_lock before calling __dev_get_by_name()
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dlci-acquire-rtnl_lock-before-calling-__dev_get_by_name.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 11eb2645cbf38a08ae491bf6c602eea900ec0bb5 Mon Sep 17 00:00:00 2001
From: Zefan Li <[email protected]>
Date: Wed, 26 Jun 2013 15:29:54 +0800
Subject: dlci: acquire rtnl_lock before calling __dev_get_by_name()
From: Zefan Li <[email protected]>
commit 11eb2645cbf38a08ae491bf6c602eea900ec0bb5 upstream.
Otherwise the net device returned can be freed at anytime.
Signed-off-by: Li Zefan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wan/dlci.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -385,20 +385,24 @@ static int dlci_del(struct dlci_add *dlc
struct net_device *master, *slave;
int err;
+ rtnl_lock();
+
/* validate slave device */
master = __dev_get_by_name(&init_net, dlci->devname);
- if (!master)
- return -ENODEV;
+ if (!master) {
+ err = -ENODEV;
+ goto out;
+ }
if (netif_running(master)) {
- return -EBUSY;
+ err = -EBUSY;
+ goto out;
}
dlp = netdev_priv(master);
slave = dlp->slave;
flp = netdev_priv(slave);
- rtnl_lock();
err = (*flp->deassoc)(slave, master);
if (!err) {
list_del(&dlp->list);
@@ -407,8 +411,8 @@ static int dlci_del(struct dlci_add *dlc
dev_put(slave);
}
+out:
rtnl_unlock();
-
return err;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.9/dlci-acquire-rtnl_lock-before-calling-__dev_get_by_name.patch
queue-3.9/dlci-validate-the-net-device-in-dlci_del.patch
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