MIPS: CPS: Fix potential NULL pointer dereferences in cps_prepare_cpus()

Check the return values of kcalloc() and exit early to avoid potential
NULL pointer dereferences.

Compile-tested only.

Cc: stable@vger.kernel.org
Fixes: 75fa6a5 ("MIPS: CPS: Introduce struct cluster_boot_config")
Fixes: 0856c14 ("MIPS: CPS: Boot CPUs in secondary clusters")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: toblux

arch/mips/kernel/smp-cps.c

@@ -332,6 +332,8 @@ static void __init cps_prepare_cpus(unsigned int max_cpus)
 	mips_cps_cluster_bootcfg = kcalloc(nclusters,
 					   sizeof(*mips_cps_cluster_bootcfg),
 					   GFP_KERNEL);
+	if (!mips_cps_cluster_bootcfg)
+		goto err_out;
 
 	if (nclusters > 1)
 		mips_cm_update_property();
@@ -348,6 +350,8 @@ static void __init cps_prepare_cpus(unsigned int max_cpus)
 		mips_cps_cluster_bootcfg[cl].core_power =
 			kcalloc(BITS_TO_LONGS(ncores), sizeof(unsigned long),
 				GFP_KERNEL);
+		if (!mips_cps_cluster_bootcfg[cl].core_power)
+			goto err_out;
 
 		/* Allocate VPE boot configuration structs */
 		for (c = 0; c < ncores; c++) {