bootconfig: Reject subkey and value on same parent key

Reject if a value node is mixed with subkey node on same
parent key node.

A value node can not co-exist with subkey node under some key
node, e.g.

key = value
key.subkey = another-value

This is not be allowed because bootconfig API is not designed
to handle such case.

Link: http://lkml.kernel.org/r/158220115232.26565.7792340045009731803.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/Documentation/admin-guide/bootconfig.rst b/Documentation/admin-guide/bootconfig.rst
index 5e76099..dfeffa7 100644 (file)
--- a/Documentation/admin-guide/bootconfig.rst
+++ b/Documentation/admin-guide/bootconfig.rst
@@ -62,6 +62,13 @@ Or more shorter, written as following::
 In both styles, same key words are automatically merged when parsing it
 at boot time. So you can append similar trees or key-values.
 
+Note that a sub-key and a value can not co-exist under a parent key.
+For example, following config is NOT allowed.::
+
+ foo = value1
+ foo.bar = value2 # !ERROR! subkey "bar" and value "value1" can NOT co-exist
+
+
 Comments
 --------
 

diff --git a/lib/bootconfig.c b/lib/bootconfig.c
index 3ea601a..54ac623 100644 (file)
--- a/lib/bootconfig.c
+++ b/lib/bootconfig.c
@@ -533,7 +533,7 @@ struct xbc_node *find_match_node(struct xbc_node *node, char *k)
 
 static int __init __xbc_add_key(char *k)
 {
-       struct xbc_node *node;
+       struct xbc_node *node, *child;
 
        if (!xbc_valid_keyword(k))
                return xbc_parse_error("Invalid keyword", k);
@@ -543,8 +543,12 @@ static int __init __xbc_add_key(char *k)
 
        if (!last_parent)       /* the first level */
                node = find_match_node(xbc_nodes, k);
-       else
-               node = find_match_node(xbc_node_get_child(last_parent), k);
+       else {
+               child = xbc_node_get_child(last_parent);
+               if (child && xbc_node_is_value(child))
+                       return xbc_parse_error("Subkey is mixed with value", k);
+               node = find_match_node(child, k);
+       }
 
        if (node)
                last_parent = node;
@@ -577,7 +581,7 @@ static int __init __xbc_parse_keys(char *k)
 static int __init xbc_parse_kv(char **k, char *v)
 {
        struct xbc_node *prev_parent = last_parent;
-       struct xbc_node *node;
+       struct xbc_node *node, *child;
        char *next;
        int c, ret;
 
@@ -585,6 +589,10 @@ static int __init xbc_parse_kv(char **k, char *v)
        if (ret)
                return ret;
 
+       child = xbc_node_get_child(last_parent);
+       if (child && xbc_node_is_key(child))
+               return xbc_parse_error("Value is mixed with subkey", v);
+
        c = __xbc_parse_value(&v, &next);
        if (c < 0)
                return c;

diff --git a/tools/bootconfig/samples/bad-mixed-kv1.bconf b/tools/bootconfig/samples/bad-mixed-kv1.bconf
new file mode 100644 (file)
index 0000000..1761547
--- /dev/null
+++ b/tools/bootconfig/samples/bad-mixed-kv1.bconf
@@ -0,0 +1,3 @@
+# value -> subkey pattern
+key = value
+key.subkey = another-value

diff --git a/tools/bootconfig/samples/bad-mixed-kv2.bconf b/tools/bootconfig/samples/bad-mixed-kv2.bconf
new file mode 100644 (file)
index 0000000..6b32e0c
--- /dev/null
+++ b/tools/bootconfig/samples/bad-mixed-kv2.bconf
@@ -0,0 +1,3 @@
+# subkey -> value pattern
+key.subkey = value
+key = another-value