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

[Jiri Pirko]

From: Jiri Pirko <j...@mellanox.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 <ido...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.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