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

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commit ac398f570724c41e5e039d54e4075519f6af7408 upstream.

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: 2ed119aef6 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guangshuo Li 2025-09-18 19:44:10 +08:00 committed by Greg Kroah-Hartman
parent 2feeecd7c6
commit a417571950
1 changed files with 3 additions and 0 deletions
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3
arch/loongarch/kernel/vdso.c
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@ -54,6 +54,9 @@ 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);