From: Jukka Rissanen <jukka.rissanen@linux.intel.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Marcel Holtmann <marcel@holtmann.org>,
Gustavo Padovan <gustavo@padovan.org>,
Johan Hedberg <johan.hedberg@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] Bluetooth: 6lowpan: use after free in disconnect_devices()
Date: Thu, 30 Oct 2014 07:54:31 +0000 [thread overview]
Message-ID: <1414655671.2918.2.camel@jrissane-mobl.ger.corp.intel.com> (raw)
In-Reply-To: <20141029161057.GF5290@mwanda>
Hi Dan,
On ke, 2014-10-29 at 19:10 +0300, Dan Carpenter wrote:
> This was accidentally changed from list_for_each_entry_safe() to
> list_for_each_entry() so now it has a use after free bug. I've changed
> it back.
Good catch! Thanks for the patch.
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
>
> Fixes: 90305829635d ('Bluetooth: 6lowpan: Converting rwlocks to use RCU')
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
> index 7254bdd..eef298d 100644
> --- a/net/bluetooth/6lowpan.c
> +++ b/net/bluetooth/6lowpan.c
> @@ -1383,7 +1383,7 @@ static const struct file_operations lowpan_control_fops = {
>
> static void disconnect_devices(void)
> {
> - struct lowpan_dev *entry, *new_dev;
> + struct lowpan_dev *entry, *tmp, *new_dev;
> struct list_head devices;
>
> INIT_LIST_HEAD(&devices);
> @@ -1408,7 +1408,7 @@ static void disconnect_devices(void)
>
> rcu_read_unlock();
>
> - list_for_each_entry(entry, &devices, list) {
> + list_for_each_entry_safe(entry, tmp, &devices, list) {
> ifdown(entry->netdev);
> BT_DBG("Unregistering netdev %s %p",
> entry->netdev->name, entry->netdev);
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
Cheers,
Jukka
next prev parent reply other threads:[~2014-10-30 7:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-29 16:10 [patch] Bluetooth: 6lowpan: use after free in disconnect_devices() Dan Carpenter
2014-10-30 7:54 ` Jukka Rissanen [this message]
2014-10-30 16:24 ` Marcel Holtmann
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