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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
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