linux-kernel - [PATCH] LoongArch: vDSO: check kcalloc() result in init

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Message-ID: <20250916145710.2994663-1-lgs201920130244@gmail.com>
Date: Tue, 16 Sep 2025 22:57:10 +0800
From: lgs201920130244@...il.com
To: Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>,
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nam Cao <namcao@...nel.org>,
	Xi Ruoyao <xry111@...111.site>,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Guangshuo Li <202321181@...l.sdu.edu.cn>,
	stable@...r.kernel.org
Subject: [PATCH] LoongArch: vDSO: check kcalloc() result in init_vdso

From: Guangshuo Li <202321181@...l.sdu.edu.cn>

Add a NULL-pointer check after the kcalloc() call in init_vdso(). If
allocation fails, return -ENOMEM to prevent a possible dereference of
vdso_info.code_mapping.pages when it is NULL.

Fixes: 2ed119aef60d ("LoongArch: Set correct size for vDSO code mapping")
Cc: stable@...r.kernel.org
Signed-off-by: Guangshuo Li <202321181@...l.sdu.edu.cn>
---
 arch/loongarch/kernel/vdso.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/vdso.c b/arch/loongarch/kernel/vdso.c
index 10cf1608c7b3..da7a7922fb24 100644
--- a/arch/loongarch/kernel/vdso.c
+++ b/arch/loongarch/kernel/vdso.c
@@ -53,7 +53,8 @@ static int __init init_vdso(void)
 	vdso_info.size = PAGE_ALIGN(vdso_end - vdso_start);
 	vdso_info.code_mapping.pages =
 		kcalloc(vdso_info.size / PAGE_SIZE, sizeof(struct page *), GFP_KERNEL);
-
+	if (!vdso_info.code_mapping.pages)
+		return -ENOMEM;
 	pfn = __phys_to_pfn(__pa_symbol(vdso_info.vdso));
 	for (i = 0; i < vdso_info.size / PAGE_SIZE; i++)
 		vdso_info.code_mapping.pages[i] = pfn_to_page(pfn + i);
-- 
2.43.0