[PATCH 15/44] param: handle NULL gracefully in bobject_get_param

[Ahmad Fatoum]

This allows using bobject_get_param with non-existent parameter names
without risking a crash inside bobject_get_param().

Signed-off-by: Ahmad Fatoum <a.fatoum at barebox.org>
---
 lib/parameter.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/parameter.c b/lib/parameter.c
index 73cc3701b938..0f9164386c6d 100644
--- a/lib/parameter.c
+++ b/lib/parameter.c
@@ -71,8 +71,14 @@ struct param_d *get_param_by_name(bobject_t _bobj, const char *name)
 const char *bobject_get_param(bobject_t _bobj, const char *name)
 {
 	struct bobject *bobj = _bobj.bobj;
-	struct param_d *param = get_param_by_name(bobj, name);
+	struct param_d *param;
 
+	if (!bobj) {
+		errno = ENODEV;
+		return NULL;
+	}
+
+	param = get_param_by_name(bobj, name);
 	if (!param) {
 		errno = EINVAL;
 		return NULL;
-- 
2.39.5