From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Tue, 7 Jul 2020 02:21:26 +0000 (+0200)
Subject: efi_loader: fix efi_get_child_controllers()
X-Git-Url: http://git.dujemihanovic.xyz/img/%7B%7B%20%24style.RelPermalink%20%7D%7D?a=commitdiff_plain;h=1047c6e23c9bf7e2e0b0c0539b6d7289627c9f71;p=u-boot.git

efi_loader: fix efi_get_child_controllers()

Don't call calloc(0, ..).
Consider return value of efi_get_child_controllers().

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 1591ad8300..0b16554ba2 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -3459,6 +3459,8 @@ static efi_status_t efi_get_child_controllers(
 	 * the buffer will be too large. But that does not harm.
 	 */
 	*number_of_children = 0;
+	if (!count)
+		return EFI_SUCCESS;
 	*child_handle_buffer = calloc(count, sizeof(efi_handle_t));
 	if (!*child_handle_buffer)
 		return EFI_OUT_OF_RESOURCES;
@@ -3536,10 +3538,12 @@ static efi_status_t EFIAPI efi_disconnect_controller(
 		number_of_children = 1;
 		child_handle_buffer = &child_handle;
 	} else {
-		efi_get_child_controllers(efiobj,
-					  driver_image_handle,
-					  &number_of_children,
-					  &child_handle_buffer);
+		r = efi_get_child_controllers(efiobj,
+					      driver_image_handle,
+					      &number_of_children,
+					      &child_handle_buffer);
+		if (r != EFI_SUCCESS)
+			return r;
 	}
 
 	/* Get the driver binding protocol */