[PATCH 1/2] loongarch/vdso: add missing NULL check after kcalloc()

[Jackie Liu <liu.yun@linux.dev>]

From: Jackie Liu <liuyun01@kylinos.cn>

The kcalloc() call in init_vdso() allocates memory for code_mapping.pages,
but its return value was not validated before use. This could cause
NULL pointer dereference if allocation fails.

Add a check for the kcalloc() result and return -ENOMEM on failure.

Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
---
 arch/loongarch/kernel/vdso.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/loongarch/kernel/vdso.c b/arch/loongarch/kernel/vdso.c
index 7b888d9085a0..088f8095210b 100644
--- a/arch/loongarch/kernel/vdso.c
+++ b/arch/loongarch/kernel/vdso.c
@@ -53,6 +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++)
-- 
2.51.0