bus: fsl-mc: Check return value of platform_get_resource()

commit 25f526507b8ccc6ac3a43bc094d09b1f9b0b90ae upstream.

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>
Acked-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/aKwuK6TRr5XNYQ8u@pc
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 3447930240b85eadffba58dfc6fbf19f394a49bb..8ae7e7bfc62489bcc6c2a795821efe441555c359 100644 (file)
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1172,6 +1172,9 @@ 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;