linux-kernel - [PATCH] bus: fsl-mc: check return value after calling platform_get

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Message-ID: <20210918073437.104667-1-yangyingliang@huawei.com>
Date:   Sat, 18 Sep 2021 15:34:37 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <laurentiu.tudor@....com>, <stuyoder@...il.com>
Subject: [PATCH] bus: fsl-mc: 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 <yangyingliang@...wei.com>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 8fd4a356a86e..a7d6eac52fde 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1168,6 +1168,8 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
 	 * Get physical address of MC portal for the root DPRC:
 	 */
 	plat_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!plat_res)
+		return -EINVAL;
 	mc_portal_phys_addr = plat_res->start;
 	mc_portal_size = resource_size(plat_res);
 	mc_portal_base_phys_addr = mc_portal_phys_addr & ~0x3ffffff;
-- 
2.25.1