From: Guangshuo Li <lgs201920130244@gmail.com>
To: "Madhavan Srinivasan" <maddy@linux.ibm.com>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Christophe Leroy" <christophe.leroy@csgroup.eu>,
"Naveen N Rao" <naveen@kernel.org>,
"Thomas Weißschuh" <thomas.weissschuh@linutronix.de>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Guangshuo Li" <lgs201920130244@gmail.com>,
"Gautham R. Shenoy" <ego@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
Subject: [PATCH v3] powerpc/smp: Add check for kcalloc() failure in parse_thread_groups()
Date: Tue, 23 Sep 2025 21:32:35 +0800 [thread overview]
Message-ID: <20250923133235.1862108-1-lgs201920130244@gmail.com> (raw)
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@vger.kernel.org
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
changelog:
v3:
- Move Signed-off-by above the '---' separator.
- No code changes.
changelog:
v2:
- Return -ENOMEM directly on allocation failure.
---
arch/powerpc/kernel/smp.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 5ac7084eebc0..cfccb9389760 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -822,6 +822,8 @@ 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
reply other threads:[~2025-09-23 14:29 UTC|newest]
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