net: core: devlink: use right genl user_ptr when handling port param get/set

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>

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 8c5ddffd707defd66da8c7b6cda530c61a37196d..5d397838bceb60554f25030a449516d7bb245550 100644 (file)
--- 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_doit(struct sk_buff *skb,
 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,