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LoongArch: vDSO: Check kcalloc() result in init_vdso()

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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 <chenhuacai@loongson.cn>
Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>
This commit is contained in:
Guangshuo Li
2025-11-03 11:15:42 +08:00
committed by maoxiaochuan
parent 382527cdb7
commit be450e0ec9
1 changed files with 3 additions and 0 deletions
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arch/loongarch/kernel/vdso.c
+3
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@@ -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);