mkimage: Automatically expand FDT in more cases

The original code did not cover every case and there was a missing negative
sign in one case. Expand the coverage and fix the bug.

Signed-off-by: Simon Glass <sjg@chromium.org>

lib/rsa/rsa-sign.c

@@ -405,11 +405,15 @@ int rsa_add_verify_data(struct image_sign_info *info, void *keydest)
 	if (parent == -FDT_ERR_NOTFOUND) {
 		parent = fdt_add_subnode(keydest, 0, FIT_SIG_NODENAME);
 		if (parent < 0) {
-			fprintf(stderr, "Couldn't create signature node: %s\n",
-				fdt_strerror(parent));
-			return -EINVAL;
+			ret = parent;
+			if (ret != -FDT_ERR_NOSPACE) {
+				fprintf(stderr, "Couldn't create signature node: %s\n",
+					fdt_strerror(parent));
+			}
 		}
 	}
+	if (ret)
+		goto done;
 
 	/* Either create or overwrite the named key node */
 	snprintf(name, sizeof(name), "key-%s", info->keyname);
@@ -417,18 +421,22 @@ int rsa_add_verify_data(struct image_sign_info *info, void *keydest)
 	if (node == -FDT_ERR_NOTFOUND) {
 		node = fdt_add_subnode(keydest, parent, name);
 		if (node < 0) {
-			fprintf(stderr, "Could not create key subnode: %s\n",
-				fdt_strerror(node));
-			return -EINVAL;
+			ret = node;
+			if (ret != -FDT_ERR_NOSPACE) {
+				fprintf(stderr, "Could not create key subnode: %s\n",
+					fdt_strerror(node));
+			}
 		}
 	} else if (node < 0) {
 		fprintf(stderr, "Cannot select keys parent: %s\n",
 			fdt_strerror(node));
-		return -ENOSPC;
+		ret = node;
 	}
 
-	ret = fdt_setprop_string(keydest, node, "key-name-hint",
+	if (!ret) {
+		ret = fdt_setprop_string(keydest, node, "key-name-hint",
 				 info->keyname);
+	}
 	if (!ret)
 		ret = fdt_setprop_u32(keydest, node, "rsa,num-bits", bits);
 	if (!ret)
@@ -449,10 +457,11 @@ int rsa_add_verify_data(struct image_sign_info *info, void *keydest)
 		ret = fdt_setprop_string(keydest, node, "required",
 					 info->require_keys);
 	}
+done:
 	BN_free(modulus);
 	BN_free(r_squared);
 	if (ret)
-		return ret == FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
+		return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
 
 	return 0;
 }

tools/image-host.c

@@ -609,11 +609,13 @@ static int fit_config_process_sig(const char *keydir, void *keydest,
 	/* Write the public key into the supplied FDT file */
 	if (keydest) {
 		ret = info.algo->add_verify_data(&info, keydest);
+		if (ret == -ENOSPC)
+			return -ENOSPC;
 		if (ret) {
 			printf("Failed to add verification data for '%s' signature node in '%s' image node\n",
 			       node_name, conf_name);
-			return ret == FDT_ERR_NOSPACE ? -ENOSPC : -EIO;
 		}
+		return ret;
 	}
 
 	return 0;