[PATCH v3 2/4] tools: mkimage: validate image references in FIT configurations

[Aristo Chen]

When parsing a FIT image source (ITS), mkimage does not currently check
whether the image names referenced in the /configurations section (e.g.
"kernel", "fdt", "ramdisk", "loadables") actually exist in the /images
node.

This patch introduces a validation step during FIT import that iterates
over each configuration and verifies that all referenced image names are
defined under /images. If a missing image is detected, an appropriate
error is reported and mkimage exits with FDT_ERR_NOTFOUND.

This ensures that configuration integrity is validated at build time.

Signed-off-by: Aristo Chen <aristo.chen at canonical.com>
---
 tools/fit_image.c | 38 ++++++++++++++++++++++++++++++++++++++
 tools/mkimage.c   |  7 ++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/tools/fit_image.c b/tools/fit_image.c
index 3d2fbad3853..bf9a6fc369a 100644
--- a/tools/fit_image.c
+++ b/tools/fit_image.c
@@ -627,6 +627,7 @@ static int fit_import_data(struct image_tool_params *params, const char *fname)
 	struct stat sbuf;
 	int ret;
 	int images;
+	int confs;
 	int node;
 
 	fd = mmap_fdt(params->cmdname, fname, 0, &old_fdt, &sbuf, false, false);
@@ -695,6 +696,43 @@ static int fit_import_data(struct image_tool_params *params, const char *fname)
 		}
 	}
 
+	confs = fdt_path_offset(fdt, FIT_CONFS_PATH);
+	static const char * const props[] = { FIT_KERNEL_PROP,
+					      FIT_RAMDISK_PROP,
+					      FIT_FDT_PROP,
+					      FIT_LOADABLE_PROP,
+					      FIT_FPGA_PROP,
+					      FIT_FIRMWARE_PROP,
+					      FIT_SCRIPT_PROP};
+
+	fdt_for_each_subnode(node, fdt, confs) {
+		const char *conf_name = fdt_get_name(fdt, node, NULL);
+
+		for (int i = 0; i < ARRAY_SIZE(props); i++) {
+			int count = fdt_stringlist_count(fdt, node, props[i]);
+
+			if (count < 0)
+				continue;
+
+			for (int j = 0; j < count; j++) {
+				const char *img_name =
+					fdt_stringlist_get(fdt, node, props[i], j, NULL);
+				if (!img_name)
+					continue;
+
+				int img = fdt_subnode_offset(fdt, images, img_name);
+
+				if (img < 0) {
+					fprintf(stderr,
+						"Error: configuration '%s' references undefined image '%s' in property '%s'\n",
+						conf_name, img_name, props[i]);
+					ret = FDT_ERR_NOTFOUND;
+					goto err_munmap;
+				}
+			}
+		}
+	}
+
 	munmap(old_fdt, sbuf.st_size);
 
 	/* Close the old fd so we can re-use it. */
diff --git a/tools/mkimage.c b/tools/mkimage.c
index 2954626a283..361711c53b2 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -519,8 +519,13 @@ int main(int argc, char **argv)
 			 */
 			retval = tparams->fflag_handle(&params);
 
-		if (retval != EXIT_SUCCESS)
+		if (retval != EXIT_SUCCESS) {
+			if (retval == FDT_ERR_NOTFOUND) {
+				// Already printed error, exit cleanly
+				exit(EXIT_FAILURE);
+			}
 			usage("Bad parameters for FIT image type");
+		}
 	}
 
 	if (params.lflag || params.fflag) {
-- 
2.43.0