From be450e0ec90847adbbc734cfe09be948bf9dcf88 Mon Sep 17 00:00:00 2001 From: Guangshuo Li <202321181@mail.sdu.edu.cn> Date: Thu, 18 Sep 2025 19:44:10 +0800 Subject: [PATCH] LoongArch: vDSO: Check kcalloc() result in init_vdso() 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. Cc: stable@vger.kernel.org Fixes: 2ed119aef60d ("LoongArch: Set correct size for vDSO code mapping") Signed-off-by: Guangshuo Li <202321181@mail.sdu.edu.cn> Signed-off-by: Huacai Chen Signed-off-by: maoxiaochuan --- arch/loongarch/kernel/vdso.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/loongarch/kernel/vdso.c b/arch/loongarch/kernel/vdso.c index 2c0d852ca..0e8793617 100644 --- a/arch/loongarch/kernel/vdso.c +++ b/arch/loongarch/kernel/vdso.c @@ -108,6 +108,9 @@ static int __init init_vdso(void) 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);