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net/tls: don't ignore netdev notifications if no TLS features 

On device surprise removal path (the notifier) we can't
bail just because the features are disabled.  They may
have been enabled during the lifetime of the device.
This bug leads to leaking netdev references and
use-after-frees if there are active connections while
device features are cleared.

Fixes: e8f6979981 ("net/tls: Add generic NIC offload infrastructure")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-05-21 19:02:02 -07:00 committed by David S. Miller
parent 3686637e50
commit c3f4a6c39c
1 changed files with 2 additions and 1 deletions
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3
net/tls/tls_device.c
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@ -997,7 +997,8 @@ static int tls_dev_event(struct notifier_block *this, unsigned long event,
{ {
struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX))) if (!dev->tlsdev_ops &&
!(dev->features & (NETIF_F_HW_TLS_RX | NETIF_F_HW_TLS_TX)))
return NOTIFY_DONE; return NOTIFY_DONE;
switch (event) { switch (event) {