[PATCH] net/tls: refine the branch condition in tls_dev_event

[Kang Chen]

dev->tlsdev_ops may be null and cause null pointer dereference later.

Fixes: eeb2efaf36c7 ("net/tls: generalize the resync callback")
Signed-off-by: Kang Chen <void0red@xxxxxxxxx>
---
 net/tls/tls_device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index a7cc4f9faac2..f30a8fe373c2 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -1449,7 +1449,8 @@ static int tls_dev_event(struct notifier_block *this, unsigned long event,
 		if (netif_is_bond_master(dev))
 			return NOTIFY_DONE;
 		if ((dev->features & NETIF_F_HW_TLS_RX) &&
-		    !dev->tlsdev_ops->tls_dev_resync)
+		   (!dev->tlsdev_ops || (dev->tlsdev_ops &&
+		    !dev->tlsdev_ops->tls_dev_resync)))
 			return NOTIFY_BAD;
 
 		if  (dev->tlsdev_ops &&
-- 
2.34.1