netdev - [PATCH v2 net] net: core: devlink: use right genl user

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Date:   Tue, 19 Jan 2021 10:53:33 +0200
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Jiri Pirko <jiri@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Parav Pandit <parav@...lanox.com>,
        Vadym Kochan <vadym.kochan@...ision.eu>
Subject: [PATCH v2 net] net: core: devlink: use right genl user_ptr when handling port param get/set

From: Oleksandr Mazur <oleksandr.mazur@...ision.eu>

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@...lanox.com>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
Signed-off-by: Vadym Kochan <vadym.kochan@...ision.eu>
---
v2:
    1) Use correct "Fixes" commit.

 net/core/devlink.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index ee828e4b1007..738d4344d679 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4146,7 +4146,7 @@ static int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
 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;
@@ -4175,7 +4175,7 @@ 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,
-- 
2.17.1