From: Oleksandr Mazur oleksandr.mazur@plvision.eu
commit 7e238de8283acd32c26c2bc2a50672d0ea862ff7 upstream.
Fix incorrect user_ptr dereferencing when handling port param get/set:
idx [0] stores the 'struct devlink' pointer; idx [1] stores the 'struct devlink_port' pointer;
Fixes: 637989b5d77e ("devlink: Always use user_ptr[0] for devlink and simplify post_doit") CC: Parav Pandit parav@mellanox.com Signed-off-by: Oleksandr Mazur oleksandr.mazur@plvision.eu Signed-off-by: Vadym Kochan vadym.kochan@plvision.eu Link: https://lore.kernel.org/r/20210119085333.16833-1-vadym.kochan@plvision.eu Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/core/devlink.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/core/devlink.c +++ b/net/core/devlink.c @@ -4134,7 +4134,7 @@ out: static int devlink_nl_cmd_port_param_get_doit(struct sk_buff *skb, struct genl_info *info) { - struct devlink_port *devlink_port = info->user_ptr[0]; + struct devlink_port *devlink_port = info->user_ptr[1]; struct devlink_param_item *param_item; struct sk_buff *msg; int err; @@ -4163,7 +4163,7 @@ static int devlink_nl_cmd_port_param_get static int devlink_nl_cmd_port_param_set_doit(struct sk_buff *skb, struct genl_info *info) { - struct devlink_port *devlink_port = info->user_ptr[0]; + struct devlink_port *devlink_port = info->user_ptr[1];
return __devlink_nl_cmd_param_set_doit(devlink_port->devlink, devlink_port->index,