[PATCH 21/26] x86/sgx: use array_size

[Julia Lawall]

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxxx>

---
 arch/x86/kernel/cpu/sgx/main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 166692f2d501..3a234942c586 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -628,7 +628,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size,
 	if (!section->virt_addr)
 		return false;
 
-	section->pages = vmalloc(nr_pages * sizeof(struct sgx_epc_page));
+	section->pages = vmalloc(array_size(nr_pages,
+					    sizeof(struct sgx_epc_page)));
 	if (!section->pages) {
 		memunmap(section->virt_addr);
 		return false;