[patch net-next v2 04/12] devlink: don't work with possible NULL pointer in devlink_param_unregister()

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

There is a WARN_ON checking the param_item for being NULL when the param
is not inserted in the list. That indicates a driver BUG. Instead of
continuing to work with NULL pointer with its consequences, return.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
---
 net/devlink/leftover.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index b1216b8f0acc..fca2b6661362 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -10824,7 +10824,8 @@ static void devlink_param_unregister(struct devlink *devlink,
 
 	param_item =
 		devlink_param_find_by_name(&devlink->param_list, param->name);
-	WARN_ON(!param_item);
+	if (WARN_ON(!param_item))
+		return;
 	devlink_param_notify(devlink, 0, param_item, DEVLINK_CMD_PARAM_DEL);
 	list_del(&param_item->list);
 	kfree(param_item);
-- 
2.39.0