linux-kernel - [PATCH] bus: fsl-mc: Check return value of platform_get

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Message-ID: <aIH4t9Ekj8hn7EEk@pc>
Date: Thu, 24 Jul 2025 10:11:19 +0100
From: Salah Triki <salah.triki@...il.com>
To: Ioana Ciornei <ioana.ciornei@....com>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Cc: salah.triki@...il.com
Subject: [PATCH] bus: fsl-mc: Check return value of platform_get_resource()

platform_get_resource() returns NULL in case of failure, so check its
return value and propagate the error in order to prevent NULL pointer
dereference.

Signed-off-by: Salah Triki <salah.triki@...il.com>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 7671bd158545..980d427e857f 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1105,6 +1105,10 @@ 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 -ENODEV;
+
 	mc_portal_phys_addr = plat_res->start;
 	mc_portal_size = resource_size(plat_res);
 	mc_portal_base_phys_addr = mc_portal_phys_addr & ~0x3ffffff;
-- 
2.43.0