linux-kernel - [PATCH net v2] net/tls: refine the branch condition in tls_dev

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Message-Id: <20230317083338.1085194-1-void0red@gmail.com>
Date:   Fri, 17 Mar 2023 16:33:38 +0800
From:   Kang Chen <void0red@...il.com>
To:     horatiu.vultur@...rochip.com
Cc:     borisp@...dia.com, davem@...emloft.net,
        dirk.vandermerwe@...ronome.com, edumazet@...gle.com,
        john.fastabend@...il.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, void0red@...il.com
Subject: [PATCH net v2] net/tls: refine the branch condition in tls_dev_event

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@...il.com>
---
v2 -> v1: simplify the condition

 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..45b07162d062 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->tls_dev_resync))
 			return NOTIFY_BAD;
 
 		if  (dev->tlsdev_ops &&
-- 
2.34.1