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virt_wifi: fix use-after-free in virt_wifi_newlink()

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When virt_wifi interface is created, virt_wifi_newlink() is called and
it calls register_netdevice().
if register_netdevice() fails, it internally would call
->priv_destructor(), which is virt_wifi_net_device_destructor() and
it frees netdev. but virt_wifi_newlink() still use netdev.
So, use-after-free would occur in virt_wifi_newlink().

Test commands:
    ip link add dummy0 type dummy
    modprobe bonding
    ip link add bonding_masters link dummy0 type virt_wifi

Splat looks like:
[  202.220554] BUG: KASAN: use-after-free in virt_wifi_newlink+0x88b/0x9a0 [virt_wifi]
[  202.221659] Read of size 8 at addr ffff888061629cb8 by task ip/852

[  202.222896] CPU: 1 PID: 852 Comm: ip Not tainted 5.4.0-rc5 #3
[  202.223765] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  202.225073] Call Trace:
[  202.225532]  dump_stack+0x7c/0xbb
[  202.226869]  print_address_description.constprop.5+0x1be/0x360
[  202.229362]  __kasan_report+0x12a/0x16f
[  202.230714]  kasan_report+0xe/0x20
[  202.232595]  virt_wifi_newlink+0x88b/0x9a0 [virt_wifi]
[  202.233370]  __rtnl_newlink+0xb9f/0x11b0
[  202.244909]  rtnl_newlink+0x65/0x90
[ ... ]

Cc: stable@vger.kernel.org
Fixes: c7cdba31ed ("mac80211-next: rtnetlink wifi simulation device")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Link: https://lore.kernel.org/r/20191121122645.9355-1-ap420073@gmail.com
[trim stack dump a bit]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Taehee Yoo 2019-11-21 12:26:45 +00:00 committed by Johannes Berg
parent 08a5bdde38
commit bc71d8b580
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/virt_wifi.c
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@ -450,7 +450,6 @@ static void virt_wifi_net_device_destructor(struct net_device *dev)
*/
kfree(dev->ieee80211_ptr);
dev->ieee80211_ptr = NULL;
free_netdev(dev);
}
/* No lock interaction. */
@ -458,7 +457,7 @@ static void virt_wifi_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &virt_wifi_ops;
dev->priv_destructor = virt_wifi_net_device_destructor;
dev->needs_free_netdev = true;
}
/* Called in a RCU read critical section from netif_receive_skb */
@ -544,6 +543,7 @@ static int virt_wifi_newlink(struct net *src_net, struct net_device *dev,
goto unregister_netdev;
}
dev->priv_destructor = virt_wifi_net_device_destructor;
priv->being_deleted = false;
priv->is_connected = false;
priv->is_up = false;