linux-kernel - [PATCH] bus: fsl-mc: Check the platform_get

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Date:   Mon,  4 Apr 2022 14:24:26 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Makarand Pawagi <makarand.pawagi@....com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] bus: fsl-mc: Check the platform_get_resource() return value

platform_get_resource() may fail and return NULL, so check it's value
before using it.

Fixes: 6305166c8771 ("bus: fsl-mc: Add ACPI support for fsl-mc")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 8fd4a356a86e..ab520b4ce885 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1168,6 +1168,9 @@ 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;
-- 
2.17.1