efi_loader: parameter check CreateEventEx()

CreateEvent() and CreateEventEx() should check that a notify function is
provided for either of EVT_NOTIFY_SIGNAL or EVT_NOTIFY_WAIT.

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

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 601b0a2cb88db82d1f9c3ef15d7d41c04f1fde86..a72cbe1559d854680611b9f16da2c124ba601396 100644 (file)
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -618,7 +618,7 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
        }
 
        if ((type & (EVT_NOTIFY_WAIT | EVT_NOTIFY_SIGNAL)) &&
-           (is_valid_tpl(notify_tpl) != EFI_SUCCESS))
+           (!notify_function || is_valid_tpl(notify_tpl) != EFI_SUCCESS))
                return EFI_INVALID_PARAMETER;
 
        evt = calloc(1, sizeof(struct efi_event));