Commit ac398f57 authored by Guangshuo Li's avatar Guangshuo Li Committed by Huacai Chen
Browse files

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: 2ed119ae ("LoongArch: Set correct size for vDSO code mapping")
Signed-off-by: default avatarGuangshuo Li <202321181@mail.sdu.edu.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 677d4a52

arch/loongarch/kernel/vdso.c

+3 −0
Original line number Diff line number Diff line
@@ -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);