linux-kernel - [PATCH] MIPS: CPS: Fix potential NULL pointer dereferences in cps_prepare

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Message-ID: <20250407163224.794608-1-thorsten.blum@linux.dev>
Date: Mon,  7 Apr 2025 18:32:21 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Gregory CLEMENT <gregory.clement@...tlin.com>,
	Dragan Mladjenovic <dragan.mladjenovic@...mia.com>,
	Aleksandar Rikalo <arikalo@...il.com>,
	Paul Burton <paulburton@...nel.org>,
	Chao-ying Fu <cfu@...ecomp.com>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	stable@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...r.kernel.org
Fixes: 75fa6a583882e ("MIPS: CPS: Introduce struct cluster_boot_config")
Fixes: 0856c143e1cd3 ("MIPS: CPS: Boot CPUs in secondary clusters")
Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 arch/mips/kernel/smp-cps.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index e85bd087467e..cc26d56f3ab6 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/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++) {
-- 
2.49.0