netdev - [patch net] net: devlink: skip info_get op call if it is not defined in dumpit

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Message-Id: <20190323232103.26673-1-jiri@resnulli.us>
Date:   Sun, 24 Mar 2019 00:21:03 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, mlxsw@...lanox.com, idosch@...lanox.com,
        jakub.kicinski@...ronome.com
Subject: [patch net] net: devlink: skip info_get op call if it is not defined in dumpit

From: Jiri Pirko <jiri@...lanox.com>

In dumpit, unlike doit, the check for info_get op being defined
is missing. Add it and avoid null pointer dereference in case driver
does not define this op.

Fixes: f9cf22882c60 ("devlink: add device information API")
Reported-by: Ido Schimmel <idosch@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 net/core/devlink.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 78e22cea4cc7..da0a29f30885 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3897,6 +3897,11 @@ static int devlink_nl_cmd_info_get_dumpit(struct sk_buff *msg,
 			continue;
 		}
 
+		if (!devlink->ops->info_get) {
+			idx++;
+			continue;
+		}
+
 		mutex_lock(&devlink->lock);
 		err = devlink_nl_info_fill(msg, devlink, DEVLINK_CMD_INFO_GET,
 					   NETLINK_CB(cb->skb).portid,
-- 
2.17.2