netdev - [PATCH] tg3: Avoid NULL pointer dereference in netif_device

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Message-Id: <1603106567-4589-1-git-send-email-bodefang@126.com>
Date:   Mon, 19 Oct 2020 19:22:47 +0800
From:   Defang Bo <bodefang@....com>
To:     siva.kallam@...adcom.com, prashant@...adcom.com,
        mchan@...adcom.com, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Defang Bo <bodefang@....com>
Subject: [PATCH] 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 ebff1fc..ae756dd 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 (!netif_running(dev))
+	if (!netdev || !netif_running(dev))
 		goto unlock;
 
 	netif_device_attach(dev);
-- 
1.9.1