linux-kernel - [PATCH v2] tg3: Avoid NULL pointer dereference in netif_device

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Date:   Wed, 21 Oct 2020 15:33:22 +0800
From:   Defang Bo <bodefang@....com>
To:     siva.kallam@...adcom.com
Cc:     prashant@...adcom.com, mchan@...adcom.com, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Defang Bo <bodefang@....com>
Subject: [PATCH v2] tg3: Avoid NULL pointer dereference in netif_device_attach()

Similar to commit<1b0ff89852d7>("tg3: Avoid NULL pointer dereference in tg3_io_error_detected()")
This patch avoids NULL pointer dereference add a check for netdev being NULL on tg3_resume().

Signed-off-by: Defang Bo <bodefang@....com>
---
 drivers/net/ethernet/broadcom/tg3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index ae756dd..345c6aa 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -18099,7 +18099,7 @@ static int tg3_resume(struct device *device)
 
 	rtnl_lock();
 
-	if (!netdev || !netif_running(dev))
+	if (!dev || !netif_running(dev))
 		goto unlock;
 
 	netif_device_attach(dev);
-- 
1.9.1