efi_loader: parameter check OutputString

Check the parameters against NULL.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 909fd5c29ef9021daecc6c4e8c29cd77a1f22a70..b2cb18e6d67021c194dff39914c5b401a6e1967d 100644 (file)
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -136,6 +136,11 @@ static efi_status_t EFIAPI efi_cout_output_string(
 
        EFI_ENTRY("%p, %p", this, string);
 
+       if (!this || !string) {
+               ret = EFI_INVALID_PARAMETER;
+               goto out;
+       }
+
        buf = malloc(utf16_utf8_strlen(string) + 1);
        if (!buf) {
                ret = EFI_OUT_OF_RESOURCES;