netdev - [PATCH net-next 1/3] net: sparx5: check return value after calling platform_get

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Date:   Sat, 26 Jun 2021 12:44:18 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>, <kuba@...nel.org>,
        <lars.povlsen@...rochip.com>, <Steen.Hegelund@...rochip.com>
Subject: [PATCH net-next 1/3] net: sparx5: 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.

Fixes: 3cfa11bac9bb ("net: sparx5: add the basic sparx5 driver")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index a325f7c05a07..665e20ccb404 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -228,6 +228,10 @@ static int sparx5_create_targets(struct sparx5 *sparx5)
 	for (idx = 0; idx < IO_RANGES; idx++) {
 		iores[idx] = platform_get_resource(sparx5->pdev, IORESOURCE_MEM,
 						   idx);
+		if (!iores[idx]) {
+			dev_err(sparx5->dev, "Invalid resource\n");
+			return -EINVAL;
+		}
 		iomem[idx] = devm_ioremap(sparx5->dev,
 					  iores[idx]->start,
 					  iores[idx]->end - iores[idx]->start
-- 
2.25.1