linux-kernel - [PATCH] powerpc/smp: Add check for kcalloc() in parse_thread

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Message-ID: <20250922150442.1820675-1-lgs201920130244@gmail.com>
Date: Mon, 22 Sep 2025 23:04:42 +0800
From: Guangshuo Li <lgs201920130244@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Charles Keepax <ckeepax@...nsource.cirrus.com>,
	Guangshuo Li <lgs201920130244@...il.com>,
	Alexandre Mergnat <amergnat@...libre.com>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Cc: stable@...r.kernel.org
Subject: [PATCH] powerpc/smp: Add check for kcalloc() in parse_thread_groups()

As kcalloc() may fail, check its return value to avoid a NULL pointer
dereference when passing it to of_property_read_u32_array().

Fixes: 790a1662d3a26 ("powerpc/smp: Parse ibm,thread-groups with multiple properties")
Cc: stable@...r.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@...il.com>
---
 arch/powerpc/kernel/smp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 5ac7084eebc0..2da064e00d0d 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -822,6 +822,9 @@ static int parse_thread_groups(struct device_node *dn,
 
 	count = of_property_count_u32_elems(dn, "ibm,thread-groups");
 	thread_group_array = kcalloc(count, sizeof(u32), GFP_KERNEL);
+	if (!thread_group_array)
+		return -ENOMEM;
+
 	ret = of_property_read_u32_array(dn, "ibm,thread-groups",
 					 thread_group_array, count);
 	if (ret)
-- 
2.43.0