diff options
| author | Eric Dumazet <edumazet@google.com> | 2018-03-05 19:51:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-31 19:10:40 +0300 |
| commit | f6cdb675ca0a0f1e1913b48060414933dbd08565 (patch) | |
| tree | 13d9ba4adaf5d4ac9028eaae8a4d7bf3439d8a74 /net/ieee802154/6lowpan | |
| parent | f77ff13a06c1185491169b78e33bfb6a169a933c (diff) | |
| download | linux-f6cdb675ca0a0f1e1913b48060414933dbd08565.tar.xz | |
ieee802154: 6lowpan: fix possible NULL deref in lowpan_device_event()
[ Upstream commit ca0edb131bdf1e6beaeb2b8289fd6b374b74147d ]
A tun device type can trivially be set to arbitrary value using
TUNSETLINK ioctl().
Therefore, lowpan_device_event() must really check that ieee802154_ptr
is not NULL.
Fixes: 2c88b5283f60d ("ieee802154: 6lowpan: remove check on null")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@osg.samsung.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ieee802154/6lowpan')
| -rw-r--r-- | net/ieee802154/6lowpan/core.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c index 974765b7d92a..e9f0489e4229 100644 --- a/net/ieee802154/6lowpan/core.c +++ b/net/ieee802154/6lowpan/core.c @@ -206,9 +206,13 @@ static inline void lowpan_netlink_fini(void) static int lowpan_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { - struct net_device *wdev = netdev_notifier_info_to_dev(ptr); + struct net_device *ndev = netdev_notifier_info_to_dev(ptr); + struct wpan_dev *wpan_dev; - if (wdev->type != ARPHRD_IEEE802154) + if (ndev->type != ARPHRD_IEEE802154) + return NOTIFY_DONE; + wpan_dev = ndev->ieee802154_ptr; + if (!wpan_dev) return NOTIFY_DONE; switch (event) { @@ -217,8 +221,8 @@ static int lowpan_device_event(struct notifier_block *unused, * also delete possible lowpan interfaces which belongs * to the wpan interface. */ - if (wdev->ieee802154_ptr->lowpan_dev) - lowpan_dellink(wdev->ieee802154_ptr->lowpan_dev, NULL); + if (wpan_dev->lowpan_dev) + lowpan_dellink(wpan_dev->lowpan_dev, NULL); break; default: return NOTIFY_DONE; |