diff -ruN git-2.9.3/fsck.c git-2.9.3_patched/fsck.c
--- git-2.9.3/fsck.c	2018-10-29 17:34:24.023464636 +0100
+++ git-2.9.3_patched/fsck.c	2018-10-29 17:37:41.345363601 +0100
@@ -94,7 +94,9 @@
 	FUNC(GITMODULES_BLOB, ERROR) \
 	FUNC(GITMODULES_PARSE, ERROR) \
 	FUNC(GITMODULES_NAME, ERROR) \
+	FUNC(GITMODULES_PATH, ERROR) \
 	FUNC(GITMODULES_SYMLINK, ERROR) \
+	FUNC(GITMODULES_URL, ERROR) \
 	/* warnings */ \
 	FUNC(BAD_FILEMODE, WARN) \
 	FUNC(EMPTY_NAME, WARN) \
@@ -872,6 +874,20 @@
 				    FSCK_MSG_GITMODULES_NAME,
 				    "disallowed submodule name: %s",
 				    name);
+
+	if (!strcmp(key, "path") && value &&
+	    looks_like_command_line_option(value))
+		data->ret |= report(data->options, data->obj,
+				    FSCK_MSG_GITMODULES_PATH,
+				    "disallowed submodule path: %s",
+				    value);
+
+	if (!strcmp(key, "url") && value &&
+	    looks_like_command_line_option(value))
+		data->ret |= report(data->options, data->obj,
+				    FSCK_MSG_GITMODULES_URL,
+				    "disallowed submodule url: %s",
+				    value);
 	free(name);
 
 	return 0;