[PATCH v2] bus: fsl-mc: Check return value of platform_get_resource()

[Salah Triki <salah.triki@gmail.com>]

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.

Fixes: 6305166c8771 ("bus: fsl-mc: Add ACPI support for fsl-mc")
Cc: <stable@vger.kernel.org>
Signed-off-by: Salah Triki <salah.triki@gmail.com>
---
Changes in v2:
   - Add Fixes and Cc tags, as suggested by Markus Elfring and Christophe
     Leroy.
   - Remove blank line before the if statement, as suggested by Markus
     Elfring.
   - Replace ENODEV with EINVAL, as suggestd by Christophe Leroy.

 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 7671bd158545..cd83cd564736 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1105,6 +1105,9 @@ 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;
-- 
2.43.0