[PATCH net-next] net: bcmgenet: check return value after calling platform_get_resource()

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <redacted>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 5335244e4577..89d16c587bb7 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c

@@ -423,6 +423,10 @@ static int bcmgenet_mii_register(struct bcmgenet_priv *priv)
 	int id, ret;
 
 	pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!pres) {
+		dev_err(&pdev->dev, "Invalid resource\n");
+		return -EINVAL;
+	}
 	memset(&res, 0, sizeof(res));
 	memset(&ppd, 0, sizeof(ppd));
 

-- 
2.25.1

On 6/7/2021 6:38 AM, Yang Yingliang wrote:

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <redacted>

Acked-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Hello:

This patch was applied to netdev/net-next.git (refs/heads/master):

On Mon, 7 Jun 2021 21:38:37 +0800 you wrote:

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <redacted>
---
 drivers/net/ethernet/broadcom/genet/bcmmii.c | 4 ++++
 1 file changed, 4 insertions(+)

Here is the summary with links:
  - [net-next] net: bcmgenet: check return value after calling platform_get_resource()
    https://git.kernel.org/netdev/net-next/c/74325bf01045

You are awesome, thank you!
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