efi_loader: CloseProtocol in tcg2_measure_gpt_data

The CloseProtocol() boot service requires a handle as first argument.
Passing the protocol interface is incorrect.

CloseProtocol() only has an effect if called with a non-zero value for
agent_handle. HandleProtocol() uses an opaque agent_handle when invoking
OpenProtocol() (currently NULL). Therefore HandleProtocol() should be
avoided.

* Replace the LocateHandle() call by efi_search_protocol().
* Remove the CloseProtocol() call.
* Remove a superfluous goto.

Fixes: ce3dbc5d080d ("efi_loader: add UEFI GPT measurement")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
index 99ec3a5..a525ebf 100644 (file)
--- a/lib/efi_loader/efi_tcg2.c
+++ b/lib/efi_loader/efi_tcg2.c
@@ -2053,7 +2053,7 @@ tcg2_measure_gpt_data(struct udevice *dev,
 {
        efi_status_t ret;
        efi_handle_t handle;
-       struct efi_handler *dp_handler;
+       struct efi_handler *dp_handler, *io_handler;
        struct efi_device_path *orig_device_path;
        struct efi_device_path *device_path;
        struct efi_device_path *dp;
@@ -2098,10 +2098,10 @@ tcg2_measure_gpt_data(struct udevice *dev,
        if (ret != EFI_SUCCESS)
                goto out1;
 
-       ret = EFI_CALL(efi_handle_protocol(handle,
-                                          &efi_block_io_guid, (void **)&block_io));
+       ret = efi_search_protocol(handle, &efi_block_io_guid, &io_handler);
        if (ret != EFI_SUCCESS)
                goto out1;
+       block_io = io_handler->protocol_interface;
 
        gpt_h = memalign(block_io->media->io_align, block_io->media->block_size);
        if (!gpt_h) {
@@ -2164,12 +2164,8 @@ tcg2_measure_gpt_data(struct udevice *dev,
        }
 
        ret = tcg2_measure_event(dev, 5, EV_EFI_GPT_EVENT, event_size, (u8 *)event);
-       if (ret != EFI_SUCCESS)
-               goto out2;
 
 out2:
-       EFI_CALL(efi_close_protocol((efi_handle_t)block_io, &efi_block_io_guid,
-                                   NULL, NULL));
        free(gpt_h);
        free(entry);
        free(event);