efi_loader: CloseProtocol in efi_fmp_find

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.

Fixes: 8d99026f0697 ("efi_loader: capsule: support firmware update")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index b6bd2d6..397e393 100644 (file)
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -159,12 +159,14 @@ efi_fmp_find(efi_guid_t *image_type, u8 image_index, u64 instance,
        efi_status_t ret;
 
        for (i = 0, handle = handles; i < no_handles; i++, handle++) {
-               ret = EFI_CALL(efi_handle_protocol(
-                               *handle,
-                               &efi_guid_firmware_management_protocol,
-                               (void **)&fmp));
+               struct efi_handler *fmp_handler;
+
+               ret = efi_search_protocol(
+                               *handle, &efi_guid_firmware_management_protocol,
+                               &fmp_handler);
                if (ret != EFI_SUCCESS)
                        continue;
+               fmp = fmp_handler->protocol_interface;
 
                /* get device's image info */
                info_size = 0;
@@ -215,10 +217,6 @@ efi_fmp_find(efi_guid_t *image_type, u8 image_index, u64 instance,
 skip:
                efi_free_pool(package_version_name);
                free(image_info);
-               EFI_CALL(efi_close_protocol(
-                               (efi_handle_t)fmp,
-                               &efi_guid_firmware_management_protocol,
-                               NULL, NULL));
                if (found)
                        return fmp;
        }